- feature 832: Folders with no images sql optimization

- recent pics are sorted by date descending, and only then by conf['order_by']
- updated prototype.js to version 1.6

git-svn-id: http://piwigo.org/svn/trunk@2424 68402e56-0260-453c-a942-63ccdbb3a9ee

1 files changed, 4030 insertions, 3086 deletions

diff --git a/tools/prototype.js b/tools/prototype.js
index c5a9ccc05..6385503a1 100644
--- a/tools/prototype.js
+++ b/tools/prototype.js
@@ -1,2792 +1,3563 @@
-/*  Prototype JavaScript framework, version 1.5.1.1
- *  (c) 2005-2007 Sam Stephenson
+/*  Prototype JavaScript framework, version 1.6.0.2
+ *  (c) 2005-2008 Sam Stephenson
  *
  *  Prototype is freely distributable under the terms of an MIT-style license.
  *  For details, see the Prototype web site: http://www.prototypejs.org/
  *
-/*--------------------------------------------------------------------------*/
+ *--------------------------------------------------------------------------*/
 
 var Prototype = {
-	Version: '1.5.1.1',
-
-	Browser: {
-		IE:     !!(window.attachEvent && !window.opera),
-		Opera:  !!window.opera,
-		WebKit: navigator.userAgent.indexOf('AppleWebKit/') > -1,
-		Gecko:  navigator.userAgent.indexOf('Gecko') > -1 && navigator.userAgent.indexOf('KHTML') == -1
-	},
-
-	BrowserFeatures: {
-		XPath: !!document.evaluate,
-		ElementExtensions: !!window.HTMLElement,
-		SpecificElementExtensions:
-			(document.createElement('div').__proto__ !==
-			 document.createElement('form').__proto__)
-	},
-
-	ScriptFragment: '<script[^>]*>([\\S\\s]*?)<\/script>',
-	JSONFilter: /^\/\*-secure-([\s\S]*)\*\/\s*$/,
-
-	emptyFunction: function() { },
-	K: function(x) { return x }
-}
+  Version: '1.6.0.2',
+
+  Browser: {
+    IE:     !!(window.attachEvent && !window.opera),
+    Opera:  !!window.opera,
+    WebKit: navigator.userAgent.indexOf('AppleWebKit/') > -1,
+    Gecko:  navigator.userAgent.indexOf('Gecko') > -1 && navigator.userAgent.indexOf('KHTML') == -1,
+    MobileSafari: !!navigator.userAgent.match(/Apple.*Mobile.*Safari/)
+  },
+
+  BrowserFeatures: {
+    XPath: !!document.evaluate,
+    ElementExtensions: !!window.HTMLElement,
+    SpecificElementExtensions:
+      document.createElement('div').__proto__ &&
+      document.createElement('div').__proto__ !==
+        document.createElement('form').__proto__
+  },
+
+  ScriptFragment: '<script[^>]*>([\\S\\s]*?)<\/script>',
+  JSONFilter: /^\/\*-secure-([\s\S]*)\*\/\s*$/,
+
+  emptyFunction: function() { },
+  K: function(x) { return x }
+};
 
+if (Prototype.Browser.MobileSafari)
+  Prototype.BrowserFeatures.SpecificElementExtensions = false;
+
+
+/* Based on Alex Arnell's inheritance implementation. */
 var Class = {
-	create: function() {
-		return function() {
-			this.initialize.apply(this, arguments);
-		}
-	}
-}
+  create: function() {
+    var parent = null, properties = $A(arguments);
+    if (Object.isFunction(properties[0]))
+      parent = properties.shift();
+
+    function klass() {
+      this.initialize.apply(this, arguments);
+    }
+
+    Object.extend(klass, Class.Methods);
+    klass.superclass = parent;
+    klass.subclasses = [];
+
+    if (parent) {
+      var subclass = function() { };
+      subclass.prototype = parent.prototype;
+      klass.prototype = new subclass;
+      parent.subclasses.push(klass);
+    }
+
+    for (var i = 0; i < properties.length; i++)
+      klass.addMethods(properties[i]);
+
+    if (!klass.prototype.initialize)
+      klass.prototype.initialize = Prototype.emptyFunction;
 
-var Abstract = new Object();
+    klass.prototype.constructor = klass;
+
+    return klass;
+  }
+};
+
+Class.Methods = {
+  addMethods: function(source) {
+    var ancestor   = this.superclass && this.superclass.prototype;
+    var properties = Object.keys(source);
+
+    if (!Object.keys({ toString: true }).length)
+      properties.push("toString", "valueOf");
+
+    for (var i = 0, length = properties.length; i < length; i++) {
+      var property = properties[i], value = source[property];
+      if (ancestor && Object.isFunction(value) &&
+          value.argumentNames().first() == "$super") {
+        var method = value, value = Object.extend((function(m) {
+          return function() { return ancestor[m].apply(this, arguments) };
+        })(property).wrap(method), {
+          valueOf:  function() { return method },
+          toString: function() { return method.toString() }
+        });
+      }
+      this.prototype[property] = value;
+    }
+
+    return this;
+  }
+};
+
+var Abstract = { };
 
 Object.extend = function(destination, source) {
-	for (var property in source) {
-		destination[property] = source[property];
-	}
-	return destination;
-}
+  for (var property in source)
+    destination[property] = source[property];
+  return destination;
+};
 
 Object.extend(Object, {
-	inspect: function(object) {
-		try {
-			if (object === undefined) return 'undefined';
-			if (object === null) return 'null';
-			return object.inspect ? object.inspect() : object.toString();
-		} catch (e) {
-			if (e instanceof RangeError) return '...';
-			throw e;
-		}
-	},
-
-	toJSON: function(object) {
-		var type = typeof object;
-		switch(type) {
-			case 'undefined':
-			case 'function':
-			case 'unknown': return;
-			case 'boolean': return object.toString();
-		}
-		if (object === null) return 'null';
-		if (object.toJSON) return object.toJSON();
-		if (object.ownerDocument === document) return;
-		var results = [];
-		for (var property in object) {
-			var value = Object.toJSON(object[property]);
-			if (value !== undefined)
-				results.push(property.toJSON() + ': ' + value);
-		}
-		return '{' + results.join(', ') + '}';
-	},
-
-	keys: function(object) {
-		var keys = [];
-		for (var property in object)
-			keys.push(property);
-		return keys;
-	},
-
-	values: function(object) {
-		var values = [];
-		for (var property in object)
-			values.push(object[property]);
-		return values;
-	},
-
-	clone: function(object) {
-		return Object.extend({}, object);
-	}
+  inspect: function(object) {
+    try {
+      if (Object.isUndefined(object)) return 'undefined';
+      if (object === null) return 'null';
+      return object.inspect ? object.inspect() : String(object);
+    } catch (e) {
+      if (e instanceof RangeError) return '...';
+      throw e;
+    }
+  },
+
+  toJSON: function(object) {
+    var type = typeof object;
+    switch (type) {
+      case 'undefined':
+      case 'function':
+      case 'unknown': return;
+      case 'boolean': return object.toString();
+    }
+
+    if (object === null) return 'null';
+    if (object.toJSON) return object.toJSON();
+    if (Object.isElement(object)) return;
+
+    var results = [];
+    for (var property in object) {
+      var value = Object.toJSON(object[property]);
+      if (!Object.isUndefined(value))
+        results.push(property.toJSON() + ': ' + value);
+    }
+
+    return '{' + results.join(', ') + '}';
+  },
+
+  toQueryString: function(object) {
+    return $H(object).toQueryString();
+  },
+
+  toHTML: function(object) {
+    return object && object.toHTML ? object.toHTML() : String.interpret(object);
+  },
+
+  keys: function(object) {
+    var keys = [];
+    for (var property in object)
+      keys.push(property);
+    return keys;
+  },
+
+  values: function(object) {
+    var values = [];
+    for (var property in object)
+      values.push(object[property]);
+    return values;
+  },
+
+  clone: function(object) {
+    return Object.extend({ }, object);
+  },
+
+  isElement: function(object) {
+    return object && object.nodeType == 1;
+  },
+
+  isArray: function(object) {
+    return object != null && typeof object == "object" &&
+      'splice' in object && 'join' in object;
+  },
+
+  isHash: function(object) {
+    return object instanceof Hash;
+  },
+
+  isFunction: function(object) {
+    return typeof object == "function";
+  },
+
+  isString: function(object) {
+    return typeof object == "string";
+  },
+
+  isNumber: function(object) {
+    return typeof object == "number";
+  },
+
+  isUndefined: function(object) {
+    return typeof object == "undefined";
+  }
 });
 
-Function.prototype.bind = function() {
-	var __method = this, args = $A(arguments), object = args.shift();
-	return function() {
-		return __method.apply(object, args.concat($A(arguments)));
-	}
-}
-
-Function.prototype.bindAsEventListener = function(object) {
-	var __method = this, args = $A(arguments), object = args.shift();
-	return function(event) {
-		return __method.apply(object, [event || window.event].concat(args));
-	}
-}
-
-Object.extend(Number.prototype, {
-	toColorPart: function() {
-		return this.toPaddedString(2, 16);
-	},
-
-	succ: function() {
-		return this + 1;
-	},
-
-	times: function(iterator) {
-		$R(0, this, true).each(iterator);
-		return this;
-	},
-
-	toPaddedString: function(length, radix) {
-		var string = this.toString(radix || 10);
-		return '0'.times(length - string.length) + string;
-	},
-
-	toJSON: function() {
-		return isFinite(this) ? this.toString() : 'null';
-	}
+Object.extend(Function.prototype, {
+  argumentNames: function() {
+    var names = this.toString().match(/^[\s\(]*function[^(]*\((.*?)\)/)[1].split(",").invoke("strip");
+    return names.length == 1 && !names[0] ? [] : names;
+  },
+
+  bind: function() {
+    if (arguments.length < 2 && Object.isUndefined(arguments[0])) return this;
+    var __method = this, args = $A(arguments), object = args.shift();
+    return function() {
+      return __method.apply(object, args.concat($A(arguments)));
+    }
+  },
+
+  bindAsEventListener: function() {
+    var __method = this, args = $A(arguments), object = args.shift();
+    return function(event) {
+      return __method.apply(object, [event || window.event].concat(args));
+    }
+  },
+
+  curry: function() {
+    if (!arguments.length) return this;
+    var __method = this, args = $A(arguments);
+    return function() {
+      return __method.apply(this, args.concat($A(arguments)));
+    }
+  },
+
+  delay: function() {
+    var __method = this, args = $A(arguments), timeout = args.shift() * 1000;
+    return window.setTimeout(function() {
+      return __method.apply(__method, args);
+    }, timeout);
+  },
+
+  wrap: function(wrapper) {
+    var __method = this;
+    return function() {
+      return wrapper.apply(this, [__method.bind(this)].concat($A(arguments)));
+    }
+  },
+
+  methodize: function() {
+    if (this._methodized) return this._methodized;
+    var __method = this;
+    return this._methodized = function() {
+      return __method.apply(null, [this].concat($A(arguments)));
+    };
+  }
 });
 
+Function.prototype.defer = Function.prototype.delay.curry(0.01);
+
 Date.prototype.toJSON = function() {
-	return '"' + this.getFullYear() + '-' +
-		(this.getMonth() + 1).toPaddedString(2) + '-' +
-		this.getDate().toPaddedString(2) + 'T' +
-		this.getHours().toPaddedString(2) + ':' +
-		this.getMinutes().toPaddedString(2) + ':' +
-		this.getSeconds().toPaddedString(2) + '"';
+  return '"' + this.getUTCFullYear() + '-' +
+    (this.getUTCMonth() + 1).toPaddedString(2) + '-' +
+    this.getUTCDate().toPaddedString(2) + 'T' +
+    this.getUTCHours().toPaddedString(2) + ':' +
+    this.getUTCMinutes().toPaddedString(2) + ':' +
+    this.getUTCSeconds().toPaddedString(2) + 'Z"';
 };
 
 var Try = {
-	these: function() {
-		var returnValue;
-
-		for (var i = 0, length = arguments.length; i < length; i++) {
-			var lambda = arguments[i];
-			try {
-				returnValue = lambda();
-				break;
-			} catch (e) {}
-		}
-
-		return returnValue;
-	}
-}
+  these: function() {
+    var returnValue;
+
+    for (var i = 0, length = arguments.length; i < length; i++) {
+      var lambda = arguments[i];
+      try {
+        returnValue = lambda();
+        break;
+      } catch (e) { }
+    }
+
+    return returnValue;
+  }
+};
+
+RegExp.prototype.match = RegExp.prototype.test;
+
+RegExp.escape = function(str) {
+  return String(str).replace(/([.*+?^=!:${}()|[\]\/\\])/g, '\\$1');
+};
 
 /*--------------------------------------------------------------------------*/
 
-var PeriodicalExecuter = Class.create();
-PeriodicalExecuter.prototype = {
-	initialize: function(callback, frequency) {
-		this.callback = callback;
-		this.frequency = frequency;
-		this.currentlyExecuting = false;
-
-		this.registerCallback();
-	},
-
-	registerCallback: function() {
-		this.timer = setInterval(this.onTimerEvent.bind(this), this.frequency * 1000);
-	},
-
-	stop: function() {
-		if (!this.timer) return;
-		clearInterval(this.timer);
-		this.timer = null;
-	},
-
-	onTimerEvent: function() {
-		if (!this.currentlyExecuting) {
-			try {
-				this.currentlyExecuting = true;
-				this.callback(this);
-			} finally {
-				this.currentlyExecuting = false;
-			}
-		}
-	}
-}
+var PeriodicalExecuter = Class.create({
+  initialize: function(callback, frequency) {
+    this.callback = callback;
+    this.frequency = frequency;
+    this.currentlyExecuting = false;
+
+    this.registerCallback();
+  },
+
+  registerCallback: function() {
+    this.timer = setInterval(this.onTimerEvent.bind(this), this.frequency * 1000);
+  },
+
+  execute: function() {
+    this.callback(this);
+  },
+
+  stop: function() {
+    if (!this.timer) return;
+    clearInterval(this.timer);
+    this.timer = null;
+  },
+
+  onTimerEvent: function() {
+    if (!this.currentlyExecuting) {
+      try {
+        this.currentlyExecuting = true;
+        this.execute();
+      } finally {
+        this.currentlyExecuting = false;
+      }
+    }
+  }
+});
 Object.extend(String, {
-	interpret: function(value) {
-		return value == null ? '' : String(value);
-	},
-	specialChar: {
-		'\b': '\\b',
-		'\t': '\\t',
-		'\n': '\\n',
-		'\f': '\\f',
-		'\r': '\\r',
-		'\\': '\\\\'
-	}
+  interpret: function(value) {
+    return value == null ? '' : String(value);
+  },
+  specialChar: {
+    '\b': '\\b',
+    '\t': '\\t',
+    '\n': '\\n',
+    '\f': '\\f',
+    '\r': '\\r',
+    '\\': '\\\\'
+  }
 });
 
 Object.extend(String.prototype, {
-	gsub: function(pattern, replacement) {
-		var result = '', source = this, match;
-		replacement = arguments.callee.prepareReplacement(replacement);
-
-		while (source.length > 0) {
-			if (match = source.match(pattern)) {
-				result += source.slice(0, match.index);
-				result += String.interpret(replacement(match));
-				source  = source.slice(match.index + match[0].length);
-			} else {
-				result += source, source = '';
-			}
-		}
-		return result;
-	},
-
-	sub: function(pattern, replacement, count) {
-		replacement = this.gsub.prepareReplacement(replacement);
-		count = count === undefined ? 1 : count;
-
-		return this.gsub(pattern, function(match) {
-			if (--count < 0) return match[0];
-			return replacement(match);
-		});
-	},
-
-	scan: function(pattern, iterator) {
-		this.gsub(pattern, iterator);
-		return this;
-	},
-
-	truncate: function(length, truncation) {
-		length = length || 30;
-		truncation = truncation === undefined ? '...' : truncation;
-		return this.length > length ?
-			this.slice(0, length - truncation.length) + truncation : this;
-	},
-
-	strip: function() {
-		return this.replace(/^\s+/, '').replace(/\s+$/, '');
-	},
-
-	stripTags: function() {
-		return this.replace(/<\/?[^>]+>/gi, '');
-	},
-
-	stripScripts: function() {
-		return this.replace(new RegExp(Prototype.ScriptFragment, 'img'), '');
-	},
-
-	extractScripts: function() {
-		var matchAll = new RegExp(Prototype.ScriptFragment, 'img');
-		var matchOne = new RegExp(Prototype.ScriptFragment, 'im');
-		return (this.match(matchAll) || []).map(function(scriptTag) {
-			return (scriptTag.match(matchOne) || ['', ''])[1];
-		});
-	},
-
-	evalScripts: function() {
-		return this.extractScripts().map(function(script) { return eval(script) });
-	},
-
-	escapeHTML: function() {
-		var self = arguments.callee;
-		self.text.data = this;
-		return self.div.innerHTML;
-	},
-
-	unescapeHTML: function() {
-		var div = document.createElement('div');
-		div.innerHTML = this.stripTags();
-		return div.childNodes[0] ? (div.childNodes.length > 1 ?
-			$A(div.childNodes).inject('', function(memo, node) { return memo+node.nodeValue }) :
-			div.childNodes[0].nodeValue) : '';
-	},
-
-	toQueryParams: function(separator) {
-		var match = this.strip().match(/([^?#]*)(#.*)?$/);
-		if (!match) return {};
-
-		return match[1].split(separator || '&').inject({}, function(hash, pair) {
-			if ((pair = pair.split('='))[0]) {
-				var key = decodeURIComponent(pair.shift());
-				var value = pair.length > 1 ? pair.join('=') : pair[0];
-				if (value != undefined) value = decodeURIComponent(value);
-
-				if (key in hash) {
-					if (hash[key].constructor != Array) hash[key] = [hash[key]];
-					hash[key].push(value);
-				}
-				else hash[key] = value;
-			}
-			return hash;
-		});
-	},
-
-	toArray: function() {
-		return this.split('');
-	},
-
-	succ: function() {
-		return this.slice(0, this.length - 1) +
-			String.fromCharCode(this.charCodeAt(this.length - 1) + 1);
-	},
-
-	times: function(count) {
-		var result = '';
-		for (var i = 0; i < count; i++) result += this;
-		return result;
-	},
-
-	camelize: function() {
-		var parts = this.split('-'), len = parts.length;
-		if (len == 1) return parts[0];
-
-		var camelized = this.charAt(0) == '-'
-			? parts[0].charAt(0).toUpperCase() + parts[0].substring(1)
-			: parts[0];
-
-		for (var i = 1; i < len; i++)
-			camelized += parts[i].charAt(0).toUpperCase() + parts[i].substring(1);
-
-		return camelized;
-	},
-
-	capitalize: function() {
-		return this.charAt(0).toUpperCase() + this.substring(1).toLowerCase();
-	},
-
-	underscore: function() {
-		return this.gsub(/::/, '/').gsub(/([A-Z]+)([A-Z][a-z])/,'#{1}_#{2}').gsub(/([a-z\d])([A-Z])/,'#{1}_#{2}').gsub(/-/,'_').toLowerCase();
-	},
-
-	dasherize: function() {
-		return this.gsub(/_/,'-');
-	},
-
-	inspect: function(useDoubleQuotes) {
-		var escapedString = this.gsub(/[\x00-\x1f\\]/, function(match) {
-			var character = String.specialChar[match[0]];
-			return character ? character : '\\u00' + match[0].charCodeAt().toPaddedString(2, 16);
-		});
-		if (useDoubleQuotes) return '"' + escapedString.replace(/"/g, '\\"') + '"';
-		return "'" + escapedString.replace(/'/g, '\\\'') + "'";
-	},
-
-	toJSON: function() {
-		return this.inspect(true);
-	},
-
-	unfilterJSON: function(filter) {
-		return this.sub(filter || Prototype.JSONFilter, '#{1}');
-	},
-
-	isJSON: function() {
-		var str = this.replace(/\\./g, '@').replace(/"[^"\\\n\r]*"/g, '');
-		return (/^[,:{}\[\]0-9.\-+Eaeflnr-u \n\r\t]*$/).test(str);
-	},
-
-	evalJSON: function(sanitize) {
-		var json = this.unfilterJSON();
-		try {
-			if (!sanitize || json.isJSON()) return eval('(' + json + ')');
-		} catch (e) { }
-		throw new SyntaxError('Badly formed JSON string: ' + this.inspect());
-	},
-
-	include: function(pattern) {
-		return this.indexOf(pattern) > -1;
-	},
-
-	startsWith: function(pattern) {
-		return this.indexOf(pattern) === 0;
-	},
-
-	endsWith: function(pattern) {
-		var d = this.length - pattern.length;
-		return d >= 0 && this.lastIndexOf(pattern) === d;
-	},
-
-	empty: function() {
-		return this == '';
-	},
-
-	blank: function() {
-		return /^\s*$/.test(this);
-	}
+  gsub: function(pattern, replacement) {
+    var result = '', source = this, match;
+    replacement = arguments.callee.prepareReplacement(replacement);
+
+    while (source.length > 0) {
+      if (match = source.match(pattern)) {
+        result += source.slice(0, match.index);
+        result += String.interpret(replacement(match));
+        source  = source.slice(match.index + match[0].length);
+      } else {
+        result += source, source = '';
+      }
+    }
+    return result;
+  },
+
+  sub: function(pattern, replacement, count) {
+    replacement = this.gsub.prepareReplacement(replacement);
+    count = Object.isUndefined(count) ? 1 : count;
+
+    return this.gsub(pattern, function(match) {
+      if (--count < 0) return match[0];
+      return replacement(match);
+    });
+  },
+
+  scan: function(pattern, iterator) {
+    this.gsub(pattern, iterator);
+    return String(this);
+  },
+
+  truncate: function(length, truncation) {
+    length = length || 30;
+    truncation = Object.isUndefined(truncation) ? '...' : truncation;
+    return this.length > length ?
+      this.slice(0, length - truncation.length) + truncation : String(this);
+  },
+
+  strip: function() {
+    return this.replace(/^\s+/, '').replace(/\s+$/, '');
+  },
+
+  stripTags: function() {
+    return this.replace(/<\/?[^>]+>/gi, '');
+  },
+
+  stripScripts: function() {
+    return this.replace(new RegExp(Prototype.ScriptFragment, 'img'), '');
+  },
+
+  extractScripts: function() {
+    var matchAll = new RegExp(Prototype.ScriptFragment, 'img');
+    var matchOne = new RegExp(Prototype.ScriptFragment, 'im');
+    return (this.match(matchAll) || []).map(function(scriptTag) {
+      return (scriptTag.match(matchOne) || ['', ''])[1];
+    });
+  },
+
+  evalScripts: function() {
+    return this.extractScripts().map(function(script) { return eval(script) });
+  },
+
+  escapeHTML: function() {
+    var self = arguments.callee;
+    self.text.data = this;
+    return self.div.innerHTML;
+  },
+
+  unescapeHTML: function() {
+    var div = new Element('div');
+    div.innerHTML = this.stripTags();
+    return div.childNodes[0] ? (div.childNodes.length > 1 ?
+      $A(div.childNodes).inject('', function(memo, node) { return memo+node.nodeValue }) :
+      div.childNodes[0].nodeValue) : '';
+  },
+
+  toQueryParams: function(separator) {
+    var match = this.strip().match(/([^?#]*)(#.*)?$/);
+    if (!match) return { };
+
+    return match[1].split(separator || '&').inject({ }, function(hash, pair) {
+      if ((pair = pair.split('='))[0]) {
+        var key = decodeURIComponent(pair.shift());
+        var value = pair.length > 1 ? pair.join('=') : pair[0];
+        if (value != undefined) value = decodeURIComponent(value);
+
+        if (key in hash) {
+          if (!Object.isArray(hash[key])) hash[key] = [hash[key]];
+          hash[key].push(value);
+        }
+        else hash[key] = value;
+      }
+      return hash;
+    });
+  },
+
+  toArray: function() {
+    return this.split('');
+  },
+
+  succ: function() {
+    return this.slice(0, this.length - 1) +
+      String.fromCharCode(this.charCodeAt(this.length - 1) + 1);
+  },
+
+  times: function(count) {
+    return count < 1 ? '' : new Array(count + 1).join(this);
+  },
+
+  camelize: function() {
+    var parts = this.split('-'), len = parts.length;
+    if (len == 1) return parts[0];
+
+    var camelized = this.charAt(0) == '-'
+      ? parts[0].charAt(0).toUpperCase() + parts[0].substring(1)
+      : parts[0];
+
+    for (var i = 1; i < len; i++)
+      camelized += parts[i].charAt(0).toUpperCase() + parts[i].substring(1);
+
+    return camelized;
+  },
+
+  capitalize: function() {
+    return this.charAt(0).toUpperCase() + this.substring(1).toLowerCase();
+  },
+
+  underscore: function() {
+    return this.gsub(/::/, '/').gsub(/([A-Z]+)([A-Z][a-z])/,'#{1}_#{2}').gsub(/([a-z\d])([A-Z])/,'#{1}_#{2}').gsub(/-/,'_').toLowerCase();
+  },
+
+  dasherize: function() {
+    return this.gsub(/_/,'-');
+  },
+
+  inspect: function(useDoubleQuotes) {
+    var escapedString = this.gsub(/[\x00-\x1f\\]/, function(match) {
+      var character = String.specialChar[match[0]];
+      return character ? character : '\\u00' + match[0].charCodeAt().toPaddedString(2, 16);
+    });
+    if (useDoubleQuotes) return '"' + escapedString.replace(/"/g, '\\"') + '"';
+    return "'" + escapedString.replace(/'/g, '\\\'') + "'";
+  },
+
+  toJSON: function() {
+    return this.inspect(true);
+  },
+
+  unfilterJSON: function(filter) {
+    return this.sub(filter || Prototype.JSONFilter, '#{1}');
+  },
+
+  isJSON: function() {
+    var str = this;
+    if (str.blank()) return false;
+    str = this.replace(/\\./g, '@').replace(/"[^"\\\n\r]*"/g, '');
+    return (/^[,:{}\[\]0-9.\-+Eaeflnr-u \n\r\t]*$/).test(str);
+  },
+
+  evalJSON: function(sanitize) {
+    var json = this.unfilterJSON();
+    try {
+      if (!sanitize || json.isJSON()) return eval('(' + json + ')');
+    } catch (e) { }
+    throw new SyntaxError('Badly formed JSON string: ' + this.inspect());
+  },
+
+  include: function(pattern) {
+    return this.indexOf(pattern) > -1;
+  },
+
+  startsWith: function(pattern) {
+    return this.indexOf(pattern) === 0;
+  },
+
+  endsWith: function(pattern) {
+    var d = this.length - pattern.length;
+    return d >= 0 && this.lastIndexOf(pattern) === d;
+  },
+
+  empty: function() {
+    return this == '';
+  },
+
+  blank: function() {
+    return /^\s*$/.test(this);
+  },
+
+  interpolate: function(object, pattern) {
+    return new Template(this, pattern).evaluate(object);
+  }
 });
 
 if (Prototype.Browser.WebKit || Prototype.Browser.IE) Object.extend(String.prototype, {
-	escapeHTML: function() {
-		return this.replace(/&/g,'&amp;').replace(/</g,'&lt;').replace(/>/g,'&gt;');
-	},
-	unescapeHTML: function() {
-		return this.replace(/&amp;/g,'&').replace(/&lt;/g,'<').replace(/&gt;/g,'>');
-	}
+  escapeHTML: function() {
+    return this.replace(/&/g,'&amp;').replace(/</g,'&lt;').replace(/>/g,'&gt;');
+  },
+  unescapeHTML: function() {
+    return this.replace(/&amp;/g,'&').replace(/&lt;/g,'<').replace(/&gt;/g,'>');
+  }
 });
 
 String.prototype.gsub.prepareReplacement = function(replacement) {
-	if (typeof replacement == 'function') return replacement;
-	var template = new Template(replacement);
-	return function(match) { return template.evaluate(match) };
-}
+  if (Object.isFunction(replacement)) return replacement;
+  var template = new Template(replacement);
+  return function(match) { return template.evaluate(match) };
+};
 
 String.prototype.parseQuery = String.prototype.toQueryParams;
 
 Object.extend(String.prototype.escapeHTML, {
-	div:  document.createElement('div'),
-	text: document.createTextNode('')
+  div:  document.createElement('div'),
+  text: document.createTextNode('')
 });
 
 with (String.prototype.escapeHTML) div.appendChild(text);
 
-var Template = Class.create();
+var Template = Class.create({
+  initialize: function(template, pattern) {
+    this.template = template.toString();
+    this.pattern = pattern || Template.Pattern;
+  },
+
+  evaluate: function(object) {
+    if (Object.isFunction(object.toTemplateReplacements))
+      object = object.toTemplateReplacements();
+
+    return this.template.gsub(this.pattern, function(match) {
+      if (object == null) return '';
+
+      var before = match[1] || '';
+      if (before == '\\') return match[2];
+
+      var ctx = object, expr = match[3];
+      var pattern = /^([^.[]+|\[((?:.*?[^\\])?)\])(\.|\[|$)/;
+      match = pattern.exec(expr);
+      if (match == null) return before;
+
+      while (match != null) {
+        var comp = match[1].startsWith('[') ? match[2].gsub('\\\\]', ']') : match[1];
+        ctx = ctx[comp];
+        if (null == ctx || '' == match[3]) break;
+        expr = expr.substring('[' == match[3] ? match[1].length : match[0].length);
+        match = pattern.exec(expr);
+      }
+
+      return before + String.interpret(ctx);
+    });
+  }
+});
 Template.Pattern = /(^|.|\r|\n)(#\{(.*?)\})/;
-Template.prototype = {
-	initialize: function(template, pattern) {
-		this.template = template.toString();
-		this.pattern  = pattern || Template.Pattern;
-	},
-
-	evaluate: function(object) {
-		return this.template.gsub(this.pattern, function(match) {
-			var before = match[1];
-			if (before == '\\') return match[2];
-			return before + String.interpret(object[match[3]]);
-		});
-	}
-}
 
-var $break = {}, $continue = new Error('"throw $continue" is deprecated, use "return" instead');
+var $break = { };
 
 var Enumerable = {
-	each: function(iterator) {
-		var index = 0;
-		try {
-			this._each(function(value) {
-				iterator(value, index++);
-			});
-		} catch (e) {
-			if (e != $break) throw e;
-		}
-		return this;
-	},
-
-	eachSlice: function(number, iterator) {
-		var index = -number, slices = [], array = this.toArray();
-		while ((index += number) < array.length)
-			slices.push(array.slice(index, index+number));
-		return slices.map(iterator);
-	},
-
-	all: function(iterator) {
-		var result = true;
-		this.each(function(value, index) {
-			result = result && !!(iterator || Prototype.K)(value, index);
-			if (!result) throw $break;
-		});
-		return result;
-	},
-
-	any: function(iterator) {
-		var result = false;
-		this.each(function(value, index) {
-			if (result = !!(iterator || Prototype.K)(value, index))
-				throw $break;
-		});
-		return result;
-	},
-
-	collect: function(iterator) {
-		var results = [];
-		this.each(function(value, index) {
-			results.push((iterator || Prototype.K)(value, index));
-		});
-		return results;
-	},
-
-	detect: function(iterator) {
-		var result;
-		this.each(function(value, index) {
-			if (iterator(value, index)) {
-				result = value;
-				throw $break;
-			}
-		});
-		return result;
-	},
-
-	findAll: function(iterator) {
-		var results = [];
-		this.each(function(value, index) {
-			if (iterator(value, index))
-				results.push(value);
-		});
-		return results;
-	},
-
-	grep: function(pattern, iterator) {
-		var results = [];
-		this.each(function(value, index) {
-			var stringValue = value.toString();
-			if (stringValue.match(pattern))
-				results.push((iterator || Prototype.K)(value, index));
-		})
-		return results;
-	},
-
-	include: function(object) {
-		var found = false;
-		this.each(function(value) {
-			if (value == object) {
-				found = true;
-				throw $break;
-			}
-		});
-		return found;
-	},
-
-	inGroupsOf: function(number, fillWith) {
-		fillWith = fillWith === undefined ? null : fillWith;
-		return this.eachSlice(number, function(slice) {
-			while(slice.length < number) slice.push(fillWith);
-			return slice;
-		});
-	},
-
-	inject: function(memo, iterator) {
-		this.each(function(value, index) {
-			memo = iterator(memo, value, index);
-		});
-		return memo;
-	},
-
-	invoke: function(method) {
-		var args = $A(arguments).slice(1);
-		return this.map(function(value) {
-			return value[method].apply(value, args);
-		});
-	},
-
-	max: function(iterator) {
-		var result;
-		this.each(function(value, index) {
-			value = (iterator || Prototype.K)(value, index);
-			if (result == undefined || value >= result)
-				result = value;
-		});
-		return result;
-	},
-
-	min: function(iterator) {
-		var result;
-		this.each(function(value, index) {
-			value = (iterator || Prototype.K)(value, index);
-			if (result == undefined || value < result)
-				result = value;
-		});
-		return result;
-	},
-
-	partition: function(iterator) {
-		var trues = [], falses = [];
-		this.each(function(value, index) {
-			((iterator || Prototype.K)(value, index) ?
-				trues : falses).push(value);
-		});
-		return [trues, falses];
-	},
-
-	pluck: function(property) {
-		var results = [];
-		this.each(function(value, index) {
-			results.push(value[property]);
-		});
-		return results;
-	},
-
-	reject: function(iterator) {
-		var results = [];
-		this.each(function(value, index) {
-			if (!iterator(value, index))
-				results.push(value);
-		});
-		return results;
-	},
-
-	sortBy: function(iterator) {
-		return this.map(function(value, index) {
-			return {value: value, criteria: iterator(value, index)};
-		}).sort(function(left, right) {
-			var a = left.criteria, b = right.criteria;
-			return a < b ? -1 : a > b ? 1 : 0;
-		}).pluck('value');
-	},
-
-	toArray: function() {
-		return this.map();
-	},
-
-	zip: function() {
-		var iterator = Prototype.K, args = $A(arguments);
-		if (typeof args.last() == 'function')
-			iterator = args.pop();
-
-		var collections = [this].concat(args).map($A);
-		return this.map(function(value, index) {
-			return iterator(collections.pluck(index));
-		});
-	},
-
-	size: function() {
-		return this.toArray().length;
-	},
-
-	inspect: function() {
-		return '#<Enumerable:' + this.toArray().inspect() + '>';
-	}
-}
+  each: function(iterator, context) {
+    var index = 0;
+    iterator = iterator.bind(context);
+    try {
+      this._each(function(value) {
+        iterator(value, index++);
+      });
+    } catch (e) {
+      if (e != $break) throw e;
+    }
+    return this;
+  },
+
+  eachSlice: function(number, iterator, context) {
+    iterator = iterator ? iterator.bind(context) : Prototype.K;
+    var index = -number, slices = [], array = this.toArray();
+    while ((index += number) < array.length)
+      slices.push(array.slice(index, index+number));
+    return slices.collect(iterator, context);
+  },
+
+  all: function(iterator, context) {
+    iterator = iterator ? iterator.bind(context) : Prototype.K;
+    var result = true;
+    this.each(function(value, index) {
+      result = result && !!iterator(value, index);
+      if (!result) throw $break;
+    });
+    return result;
+  },
+
+  any: function(iterator, context) {
+    iterator = iterator ? iterator.bind(context) : Prototype.K;
+    var result = false;
+    this.each(function(value, index) {
+      if (result = !!iterator(value, index))
+        throw $break;
+    });
+    return result;
+  },
+
+  collect: function(iterator, context) {
+    iterator = iterator ? iterator.bind(context) : Prototype.K;
+    var results = [];
+    this.each(function(value, index) {
+      results.push(iterator(value, index));
+    });
+    return results;
+  },
+
+  detect: function(iterator, context) {
+    iterator = iterator.bind(context);
+    var result;
+    this.each(function(value, index) {
+      if (iterator(value, index)) {
+        result = value;
+        throw $break;
+      }
+    });
+    return result;
+  },
+
+  findAll: function(iterator, context) {
+    iterator = iterator.bind(context);
+    var results = [];
+    this.each(function(value, index) {
+      if (iterator(value, index))
+        results.push(value);
+    });
+    return results;
+  },
+
+  grep: function(filter, iterator, context) {
+    iterator = iterator ? iterator.bind(context) : Prototype.K;
+    var results = [];
+
+    if (Object.isString(filter))
+      filter = new RegExp(filter);
+
+    this.each(function(value, index) {
+      if (filter.match(value))
+        results.push(iterator(value, index));
+    });
+    return results;
+  },
+
+  include: function(object) {
+    if (Object.isFunction(this.indexOf))
+      if (this.indexOf(object) != -1) return true;
+
+    var found = false;
+    this.each(function(value) {
+      if (value == object) {
+        found = true;
+        throw $break;
+      }
+    });
+    return found;
+  },
+
+  inGroupsOf: function(number, fillWith) {
+    fillWith = Object.isUndefined(fillWith) ? null : fillWith;
+    return this.eachSlice(number, function(slice) {
+      while(slice.length < number) slice.push(fillWith);
+      return slice;
+    });
+  },
+
+  inject: function(memo, iterator, context) {
+    iterator = iterator.bind(context);
+    this.each(function(value, index) {
+      memo = iterator(memo, value, index);
+    });
+    return memo;
+  },
+
+  invoke: function(method) {
+    var args = $A(arguments).slice(1);
+    return this.map(function(value) {
+      return value[method].apply(value, args);
+    });
+  },
+
+  max: function(iterator, context) {
+    iterator = iterator ? iterator.bind(context) : Prototype.K;
+    var result;
+    this.each(function(value, index) {
+      value = iterator(value, index);
+      if (result == null || value >= result)
+        result = value;
+    });
+    return result;
+  },
+
+  min: function(iterator, context) {
+    iterator = iterator ? iterator.bind(context) : Prototype.K;
+    var result;
+    this.each(function(value, index) {
+      value = iterator(value, index);
+      if (result == null || value < result)
+        result = value;
+    });
+    return result;
+  },
+
+  partition: function(iterator, context) {
+    iterator = iterator ? iterator.bind(context) : Prototype.K;
+    var trues = [], falses = [];
+    this.each(function(value, index) {
+      (iterator(value, index) ?
+        trues : falses).push(value);
+    });
+    return [trues, falses];
+  },
+
+  pluck: function(property) {
+    var results = [];
+    this.each(function(value) {
+      results.push(value[property]);
+    });
+    return results;
+  },
+
+  reject: function(iterator, context) {
+    iterator = iterator.bind(context);
+    var results = [];
+    this.each(function(value, index) {
+      if (!iterator(value, index))
+        results.push(value);
+    });
+    return results;
+  },
+
+  sortBy: function(iterator, context) {
+    iterator = iterator.bind(context);
+    return this.map(function(value, index) {
+      return {value: value, criteria: iterator(value, index)};
+    }).sort(function(left, right) {
+      var a = left.criteria, b = right.criteria;
+      return a < b ? -1 : a > b ? 1 : 0;
+    }).pluck('value');
+  },
+
+  toArray: function() {
+    return this.map();
+  },
+
+  zip: function() {
+    var iterator = Prototype.K, args = $A(arguments);
+    if (Object.isFunction(args.last()))
+      iterator = args.pop();
+
+    var collections = [this].concat(args).map($A);
+    return this.map(function(value, index) {
+      return iterator(collections.pluck(index));
+    });
+  },
+
+  size: function() {
+    return this.toArray().length;
+  },
+
+  inspect: function() {
+    return '#<Enumerable:' + this.toArray().inspect() + '>';
+  }
+};
 
 Object.extend(Enumerable, {
-	map:     Enumerable.collect,
-	find:    Enumerable.detect,
-	select:  Enumerable.findAll,
-	member:  Enumerable.include,
-	entries: Enumerable.toArray
+  map:     Enumerable.collect,
+  find:    Enumerable.detect,
+  select:  Enumerable.findAll,
+  filter:  Enumerable.findAll,
+  member:  Enumerable.include,
+  entries: Enumerable.toArray,
+  every:   Enumerable.all,
+  some:    Enumerable.any
 });
-var $A = Array.from = function(iterable) {
-	if (!iterable) return [];
-	if (iterable.toArray) {
-		return iterable.toArray();
-	} else {
-		var results = [];
-		for (var i = 0, length = iterable.length; i < length; i++)
-			results.push(iterable[i]);
-		return results;
-	}
+function $A(iterable) {
+  if (!iterable) return [];
+  if (iterable.toArray) return iterable.toArray();
+  var length = iterable.length || 0, results = new Array(length);
+  while (length--) results[length] = iterable[length];
+  return results;
 }
 
 if (Prototype.Browser.WebKit) {
-	$A = Array.from = function(iterable) {
-		if (!iterable) return [];
-		if (!(typeof iterable == 'function' && iterable == '[object NodeList]') &&
-			iterable.toArray) {
-			return iterable.toArray();
-		} else {
-			var results = [];
-			for (var i = 0, length = iterable.length; i < length; i++)
-				results.push(iterable[i]);
-			return results;
-		}
-	}
+  $A = function(iterable) {
+    if (!iterable) return [];
+    if (!(Object.isFunction(iterable) && iterable == '[object NodeList]') &&
+        iterable.toArray) return iterable.toArray();
+    var length = iterable.length || 0, results = new Array(length);
+    while (length--) results[length] = iterable[length];
+    return results;
+  };
 }
 
+Array.from = $A;
+
 Object.extend(Array.prototype, Enumerable);
 
-if (!Array.prototype._reverse)
-	Array.prototype._reverse = Array.prototype.reverse;
+if (!Array.prototype._reverse) Array.prototype._reverse = Array.prototype.reverse;
 
 Object.extend(Array.prototype, {
-	_each: function(iterator) {
-		for (var i = 0, length = this.length; i < length; i++)
-			iterator(this[i]);
-	},
-
-	clear: function() {
-		this.length = 0;
-		return this;
-	},
-
-	first: function() {
-		return this[0];
-	},
-
-	last: function() {
-		return this[this.length - 1];
-	},
-
-	compact: function() {
-		return this.select(function(value) {
-			return value != null;
-		});
-	},
-
-	flatten: function() {
-		return this.inject([], function(array, value) {
-			return array.concat(value && value.constructor == Array ?
-				value.flatten() : [value]);
-		});
-	},
-
-	without: function() {
-		var values = $A(arguments);
-		return this.select(function(value) {
-			return !values.include(value);
-		});
-	},
-
-	indexOf: function(object) {
-		for (var i = 0, length = this.length; i < length; i++)
-			if (this[i] == object) return i;
-		return -1;
-	},
-
-	reverse: function(inline) {
-		return (inline !== false ? this : this.toArray())._reverse();
-	},
-
-	reduce: function() {
-		return this.length > 1 ? this : this[0];
-	},
-
-	uniq: function(sorted) {
-		return this.inject([], function(array, value, index) {
-			if (0 == index || (sorted ? array.last() != value : !array.include(value)))
-				array.push(value);
-			return array;
-		});
-	},
-
-	clone: function() {
-		return [].concat(this);
-	},
-
-	size: function() {
-		return this.length;
-	},
-
-	inspect: function() {
-		return '[' + this.map(Object.inspect).join(', ') + ']';
-	},
-
-	toJSON: function() {
-		var results = [];
-		this.each(function(object) {
-			var value = Object.toJSON(object);
-			if (value !== undefined) results.push(value);
-		});
-		return '[' + results.join(', ') + ']';
-	}
+  _each: function(iterator) {
+    for (var i = 0, length = this.length; i < length; i++)
+      iterator(this[i]);
+  },
+
+  clear: function() {
+    this.length = 0;
+    return this;
+  },
+
+  first: function() {
+    return this[0];
+  },
+
+  last: function() {
+    return this[this.length - 1];
+  },
+
+  compact: function() {
+    return this.select(function(value) {
+      return value != null;
+    });
+  },
+
+  flatten: function() {
+    return this.inject([], function(array, value) {
+      return array.concat(Object.isArray(value) ?
+        value.flatten() : [value]);
+    });
+  },
+
+  without: function() {
+    var values = $A(arguments);
+    return this.select(function(value) {
+      return !values.include(value);
+    });
+  },
+
+  reverse: function(inline) {
+    return (inline !== false ? this : this.toArray())._reverse();
+  },
+
+  reduce: function() {
+    return this.length > 1 ? this : this[0];
+  },
+
+  uniq: function(sorted) {
+    return this.inject([], function(array, value, index) {
+      if (0 == index || (sorted ? array.last() != value : !array.include(value)))
+        array.push(value);
+      return array;
+    });
+  },
+
+  intersect: function(array) {
+    return this.uniq().findAll(function(item) {
+      return array.detect(function(value) { return item === value });
+    });
+  },
+
+  clone: function() {
+    return [].concat(this);
+  },
+
+  size: function() {
+    return this.length;
+  },
+
+  inspect: function() {
+    return '[' + this.map(Object.inspect).join(', ') + ']';
+  },
+
+  toJSON: function() {
+    var results = [];
+    this.each(function(object) {
+      var value = Object.toJSON(object);
+      if (!Object.isUndefined(value)) results.push(value);
+    });
+    return '[' + results.join(', ') + ']';
+  }
 });
 
+// use native browser JS 1.6 implementation if available
+if (Object.isFunction(Array.prototype.forEach))
+  Array.prototype._each = Array.prototype.forEach;
+
+if (!Array.prototype.indexOf) Array.prototype.indexOf = function(item, i) {
+  i || (i = 0);
+  var length = this.length;
+  if (i < 0) i = length + i;
+  for (; i < length; i++)
+    if (this[i] === item) return i;
+  return -1;
+};
+
+if (!Array.prototype.lastIndexOf) Array.prototype.lastIndexOf = function(item, i) {
+  i = isNaN(i) ? this.length : (i < 0 ? this.length + i : i) + 1;
+  var n = this.slice(0, i).reverse().indexOf(item);
+  return (n < 0) ? n : i - n - 1;
+};
+
 Array.prototype.toArray = Array.prototype.clone;
 
 function $w(string) {
-	string = string.strip();
-	return string ? string.split(/\s+/) : [];
+  if (!Object.isString(string)) return [];
+  string = string.strip();
+  return string ? string.split(/\s+/) : [];
 }
 
 if (Prototype.Browser.Opera){
-	Array.prototype.concat = function() {
-		var array = [];
-		for (var i = 0, length = this.length; i < length; i++) array.push(this[i]);
-		for (var i = 0, length = arguments.length; i < length; i++) {
-			if (arguments[i].constructor == Array) {
-				for (var j = 0, arrayLength = arguments[i].length; j < arrayLength; j++)
-					array.push(arguments[i][j]);
-			} else {
-				array.push(arguments[i]);
-			}
-		}
-		return array;
-	}
+  Array.prototype.concat = function() {
+    var array = [];
+    for (var i = 0, length = this.length; i < length; i++) array.push(this[i]);
+    for (var i = 0, length = arguments.length; i < length; i++) {
+      if (Object.isArray(arguments[i])) {
+        for (var j = 0, arrayLength = arguments[i].length; j < arrayLength; j++)
+          array.push(arguments[i][j]);
+      } else {
+        array.push(arguments[i]);
+      }
+    }
+    return array;
+  };
 }
-var Hash = function(object) {
-	if (object instanceof Hash) this.merge(object);
-	else Object.extend(this, object || {});
-};
-
-Object.extend(Hash, {
-	toQueryString: function(obj) {
-		var parts = [];
-		parts.add = arguments.callee.addPair;
-
-		this.prototype._each.call(obj, function(pair) {
-			if (!pair.key) return;
-			var value = pair.value;
-
-			if (value && typeof value == 'object') {
-				if (value.constructor == Array) value.each(function(value) {
-					parts.add(pair.key, value);
-				});
-				return;
-			}
-			parts.add(pair.key, value);
-		});
-
-		return parts.join('&');
-	},
-
-	toJSON: function(object) {
-		var results = [];
-		this.prototype._each.call(object, function(pair) {
-			var value = Object.toJSON(pair.value);
-			if (value !== undefined) results.push(pair.key.toJSON() + ': ' + value);
-		});
-		return '{' + results.join(', ') + '}';
-	}
+Object.extend(Number.prototype, {
+  toColorPart: function() {
+    return this.toPaddedString(2, 16);
+  },
+
+  succ: function() {
+    return this + 1;
+  },
+
+  times: function(iterator) {
+    $R(0, this, true).each(iterator);
+    return this;
+  },
+
+  toPaddedString: function(length, radix) {
+    var string = this.toString(radix || 10);
+    return '0'.times(length - string.length) + string;
+  },
+
+  toJSON: function() {
+    return isFinite(this) ? this.toString() : 'null';
+  }
 });
 
-Hash.toQueryString.addPair = function(key, value, prefix) {
-	key = encodeURIComponent(key);
-	if (value === undefined) this.push(key);
-	else this.push(key + '=' + (value == null ? '' : encodeURIComponent(value)));
-}
-
-Object.extend(Hash.prototype, Enumerable);
-Object.extend(Hash.prototype, {
-	_each: function(iterator) {
-		for (var key in this) {
-			var value = this[key];
-			if (value && value == Hash.prototype[key]) continue;
-
-			var pair = [key, value];
-			pair.key = key;
-			pair.value = value;
-			iterator(pair);
-		}
-	},
-
-	keys: function() {
-		return this.pluck('key');
-	},
-
-	values: function() {
-		return this.pluck('value');
-	},
-
-	merge: function(hash) {
-		return $H(hash).inject(this, function(mergedHash, pair) {
-			mergedHash[pair.key] = pair.value;
-			return mergedHash;
-		});
-	},
-
-	remove: function() {
-		var result;
-		for(var i = 0, length = arguments.length; i < length; i++) {
-			var value = this[arguments[i]];
-			if (value !== undefined){
-				if (result === undefined) result = value;
-				else {
-					if (result.constructor != Array) result = [result];
-					result.push(value)
-				}
-			}
-			delete this[arguments[i]];
-		}
-		return result;
-	},
-
-	toQueryString: function() {
-		return Hash.toQueryString(this);
-	},
-
-	inspect: function() {
-		return '#<Hash:{' + this.map(function(pair) {
-			return pair.map(Object.inspect).join(': ');
-		}).join(', ') + '}>';
-	},
-
-	toJSON: function() {
-		return Hash.toJSON(this);
-	}
+$w('abs round ceil floor').each(function(method){
+  Number.prototype[method] = Math[method].methodize();
 });
-
 function $H(object) {
-	if (object instanceof Hash) return object;
-	return new Hash(object);
+  return new Hash(object);
 };
 
-// Safari iterates over shadowed properties
-if (function() {
-	var i = 0, Test = function(value) { this.key = value };
-	Test.prototype.key = 'foo';
-	for (var property in new Test('bar')) i++;
-	return i > 1;
-}()) Hash.prototype._each = function(iterator) {
-	var cache = [];
-	for (var key in this) {
-		var value = this[key];
-		if ((value && value == Hash.prototype[key]) || cache.include(key)) continue;
-		cache.push(key);
-		var pair = [key, value];
-		pair.key = key;
-		pair.value = value;
-		iterator(pair);
-	}
-};
-ObjectRange = Class.create();
-Object.extend(ObjectRange.prototype, Enumerable);
-Object.extend(ObjectRange.prototype, {
-	initialize: function(start, end, exclusive) {
-		this.start = start;
-		this.end = end;
-		this.exclusive = exclusive;
-	},
-
-	_each: function(iterator) {
-		var value = this.start;
-		while (this.include(value)) {
-			iterator(value);
-			value = value.succ();
-		}
-	},
-
-	include: function(value) {
-		if (value < this.start)
-			return false;
-		if (this.exclusive)
-			return value < this.end;
-		return value <= this.end;
-	}
+var Hash = Class.create(Enumerable, (function() {
+
+  function toQueryPair(key, value) {
+    if (Object.isUndefined(value)) return key;
+    return key + '=' + encodeURIComponent(String.interpret(value));
+  }
+
+  return {
+    initialize: function(object) {
+      this._object = Object.isHash(object) ? object.toObject() : Object.clone(object);
+    },
+
+    _each: function(iterator) {
+      for (var key in this._object) {
+        var value = this._object[key], pair = [key, value];
+        pair.key = key;
+        pair.value = value;
+        iterator(pair);
+      }
+    },
+
+    set: function(key, value) {
+      return this._object[key] = value;
+    },
+
+    get: function(key) {
+      return this._object[key];
+    },
+
+    unset: function(key) {
+      var value = this._object[key];
+      delete this._object[key];
+      return value;
+    },
+
+    toObject: function() {
+      return Object.clone(this._object);
+    },
+
+    keys: function() {
+      return this.pluck('key');
+    },
+
+    values: function() {
+      return this.pluck('value');
+    },
+
+    index: function(value) {
+      var match = this.detect(function(pair) {
+        return pair.value === value;
+      });
+      return match && match.key;
+    },
+
+    merge: function(object) {
+      return this.clone().update(object);
+    },
+
+    update: function(object) {
+      return new Hash(object).inject(this, function(result, pair) {
+        result.set(pair.key, pair.value);
+        return result;
+      });
+    },
+
+    toQueryString: function() {
+      return this.map(function(pair) {
+        var key = encodeURIComponent(pair.key), values = pair.value;
+
+        if (values && typeof values == 'object') {
+          if (Object.isArray(values))
+            return values.map(toQueryPair.curry(key)).join('&');
+        }
+        return toQueryPair(key, values);
+      }).join('&');
+    },
+
+    inspect: function() {
+      return '#<Hash:{' + this.map(function(pair) {
+        return pair.map(Object.inspect).join(': ');
+      }).join(', ') + '}>';
+    },
+
+    toJSON: function() {
+      return Object.toJSON(this.toObject());
+    },
+
+    clone: function() {
+      return new Hash(this);
+    }
+  }
+})());
+
+Hash.prototype.toTemplateReplacements = Hash.prototype.toObject;
+Hash.from = $H;
+var ObjectRange = Class.create(Enumerable, {
+  initialize: function(start, end, exclusive) {
+    this.start = start;
+    this.end = end;
+    this.exclusive = exclusive;
+  },
+
+  _each: function(iterator) {
+    var value = this.start;
+    while (this.include(value)) {
+      iterator(value);
+      value = value.succ();
+    }
+  },
+
+  include: function(value) {
+    if (value < this.start)
+      return false;
+    if (this.exclusive)
+      return value < this.end;
+    return value <= this.end;
+  }
 });
 
 var $R = function(start, end, exclusive) {
-	return new ObjectRange(start, end, exclusive);
-}
+  return new ObjectRange(start, end, exclusive);
+};
 
 var Ajax = {
-	getTransport: function() {
-		return Try.these(
-			function() {return new XMLHttpRequest()},
-			function() {return new ActiveXObject('Msxml2.XMLHTTP')},
-			function() {return new ActiveXObject('Microsoft.XMLHTTP')}
-		) || false;
-	},
-
-	activeRequestCount: 0
-}
+  getTransport: function() {
+    return Try.these(
+      function() {return new XMLHttpRequest()},
+      function() {return new ActiveXObject('Msxml2.XMLHTTP')},
+      function() {return new ActiveXObject('Microsoft.XMLHTTP')}
+    ) || false;
+  },
+
+  activeRequestCount: 0
+};
 
 Ajax.Responders = {
-	responders: [],
-
-	_each: function(iterator) {
-		this.responders._each(iterator);
-	},
-
-	register: function(responder) {
-		if (!this.include(responder))
-			this.responders.push(responder);
-	},
-
-	unregister: function(responder) {
-		this.responders = this.responders.without(responder);
-	},
-
-	dispatch: function(callback, request, transport, json) {
-		this.each(function(responder) {
-			if (typeof responder[callback] == 'function') {
-				try {
-					responder[callback].apply(responder, [request, transport, json]);
-				} catch (e) {}
-			}
-		});
-	}
+  responders: [],
+
+  _each: function(iterator) {
+    this.responders._each(iterator);
+  },
+
+  register: function(responder) {
+    if (!this.include(responder))
+      this.responders.push(responder);
+  },
+
+  unregister: function(responder) {
+    this.responders = this.responders.without(responder);
+  },
+
+  dispatch: function(callback, request, transport, json) {
+    this.each(function(responder) {
+      if (Object.isFunction(responder[callback])) {
+        try {
+          responder[callback].apply(responder, [request, transport, json]);
+        } catch (e) { }
+      }
+    });
+  }
 };
 
 Object.extend(Ajax.Responders, Enumerable);
 
 Ajax.Responders.register({
-	onCreate: function() {
-		Ajax.activeRequestCount++;
-	},
-	onComplete: function() {
-		Ajax.activeRequestCount--;
-	}
+  onCreate:   function() { Ajax.activeRequestCount++ },
+  onComplete: function() { Ajax.activeRequestCount-- }
 });
 
-Ajax.Base = function() {};
-Ajax.Base.prototype = {
-	setOptions: function(options) {
-		this.options = {
-			method:       'post',
-			asynchronous: true,
-			contentType:  'application/x-www-form-urlencoded',
-			encoding:     'UTF-8',
-			parameters:   ''
-		}
-		Object.extend(this.options, options || {});
-
-		this.options.method = this.options.method.toLowerCase();
-		if (typeof this.options.parameters == 'string')
-			this.options.parameters = this.options.parameters.toQueryParams();
-	}
-}
+Ajax.Base = Class.create({
+  initialize: function(options) {
+    this.options = {
+      method:       'post',
+      asynchronous: true,
+      contentType:  'application/x-www-form-urlencoded',
+      encoding:     'UTF-8',
+      parameters:   '',
+      evalJSON:     true,
+      evalJS:       true
+    };
+    Object.extend(this.options, options || { });
+
+    this.options.method = this.options.method.toLowerCase();
+
+    if (Object.isString(this.options.parameters))
+      this.options.parameters = this.options.parameters.toQueryParams();
+    else if (Object.isHash(this.options.parameters))
+      this.options.parameters = this.options.parameters.toObject();
+  }
+});
+
+Ajax.Request = Class.create(Ajax.Base, {
+  _complete: false,
+
+  initialize: function($super, url, options) {
+    $super(options);
+    this.transport = Ajax.getTransport();
+    this.request(url);
+  },
+
+  request: function(url) {
+    this.url = url;
+    this.method = this.options.method;
+    var params = Object.clone(this.options.parameters);
+
+    if (!['get', 'post'].include(this.method)) {
+      // simulate other verbs over post
+      params['_method'] = this.method;
+      this.method = 'post';
+    }
+
+    this.parameters = params;
+
+    if (params = Object.toQueryString(params)) {
+      // when GET, append parameters to URL
+      if (this.method == 'get')
+        this.url += (this.url.include('?') ? '&' : '?') + params;
+      else if (/Konqueror|Safari|KHTML/.test(navigator.userAgent))
+        params += '&_=';
+    }
+
+    try {
+      var response = new Ajax.Response(this);
+      if (this.options.onCreate) this.options.onCreate(response);
+      Ajax.Responders.dispatch('onCreate', this, response);
+
+      this.transport.open(this.method.toUpperCase(), this.url,
+        this.options.asynchronous);
+
+      if (this.options.asynchronous) this.respondToReadyState.bind(this).defer(1);
+
+      this.transport.onreadystatechange = this.onStateChange.bind(this);
+      this.setRequestHeaders();
+
+      this.body = this.method == 'post' ? (this.options.postBody || params) : null;
+      this.transport.send(this.body);
+
+      /* Force Firefox to handle ready state 4 for synchronous requests */
+      if (!this.options.asynchronous && this.transport.overrideMimeType)
+        this.onStateChange();
+
+    }
+    catch (e) {
+      this.dispatchException(e);
+    }
+  },
+
+  onStateChange: function() {
+    var readyState = this.transport.readyState;
+    if (readyState > 1 && !((readyState == 4) && this._complete))
+      this.respondToReadyState(this.transport.readyState);
+  },
+
+  setRequestHeaders: function() {
+    var headers = {
+      'X-Requested-With': 'XMLHttpRequest',
+      'X-Prototype-Version': Prototype.Version,
+      'Accept': 'text/javascript, text/html, application/xml, text/xml, */*'
+    };
+
+    if (this.method == 'post') {
+      headers['Content-type'] = this.options.contentType +
+        (this.options.encoding ? '; charset=' + this.options.encoding : '');
+
+      /* Force "Connection: close" for older Mozilla browsers to work
+       * around a bug where XMLHttpRequest sends an incorrect
+       * Content-length header. See Mozilla Bugzilla #246651.
+       */
+      if (this.transport.overrideMimeType &&
+          (navigator.userAgent.match(/Gecko\/(\d{4})/) || [0,2005])[1] < 2005)
+            headers['Connection'] = 'close';
+    }
+
+    // user-defined headers
+    if (typeof this.options.requestHeaders == 'object') {
+      var extras = this.options.requestHeaders;
+
+      if (Object.isFunction(extras.push))
+        for (var i = 0, length = extras.length; i < length; i += 2)
+          headers[extras[i]] = extras[i+1];
+      else
+        $H(extras).each(function(pair) { headers[pair.key] = pair.value });
+    }
+
+    for (var name in headers)
+      this.transport.setRequestHeader(name, headers[name]);
+  },
+
+  success: function() {
+    var status = this.getStatus();
+    return !status || (status >= 200 && status < 300);
+  },
+
+  getStatus: function() {
+    try {
+      return this.transport.status || 0;
+    } catch (e) { return 0 }
+  },
+
+  respondToReadyState: function(readyState) {
+    var state = Ajax.Request.Events[readyState], response = new Ajax.Response(this);
+
+    if (state == 'Complete') {
+      try {
+        this._complete = true;
+        (this.options['on' + response.status]
+         || this.options['on' + (this.success() ? 'Success' : 'Failure')]
+         || Prototype.emptyFunction)(response, response.headerJSON);
+      } catch (e) {
+        this.dispatchException(e);
+      }
+
+      var contentType = response.getHeader('Content-type');
+      if (this.options.evalJS == 'force'
+          || (this.options.evalJS && this.isSameOrigin() && contentType
+          && contentType.match(/^\s*(text|application)\/(x-)?(java|ecma)script(;.*)?\s*$/i)))
+        this.evalResponse();
+    }
+
+    try {
+      (this.options['on' + state] || Prototype.emptyFunction)(response, response.headerJSON);
+      Ajax.Responders.dispatch('on' + state, this, response, response.headerJSON);
+    } catch (e) {
+      this.dispatchException(e);
+    }
+
+    if (state == 'Complete') {
+      // avoid memory leak in MSIE: clean up
+      this.transport.onreadystatechange = Prototype.emptyFunction;
+    }
+  },
+
+  isSameOrigin: function() {
+    var m = this.url.match(/^\s*https?:\/\/[^\/]*/);
+    return !m || (m[0] == '#{protocol}//#{domain}#{port}'.interpolate({
+      protocol: location.protocol,
+      domain: document.domain,
+      port: location.port ? ':' + location.port : ''
+    }));
+  },
+
+  getHeader: function(name) {
+    try {
+      return this.transport.getResponseHeader(name) || null;
+    } catch (e) { return null }
+  },
+
+  evalResponse: function() {
+    try {
+      return eval((this.transport.responseText || '').unfilterJSON());
+    } catch (e) {
+      this.dispatchException(e);
+    }
+  },
+
+  dispatchException: function(exception) {
+    (this.options.onException || Prototype.emptyFunction)(this, exception);
+    Ajax.Responders.dispatch('onException', this, exception);
+  }
+});
 
-Ajax.Request = Class.create();
 Ajax.Request.Events =
-	['Uninitialized', 'Loading', 'Loaded', 'Interactive', 'Complete'];
-
-Ajax.Request.prototype = Object.extend(new Ajax.Base(), {
-	_complete: false,
-
-	initialize: function(url, options) {
-		this.transport = Ajax.getTransport();
-		this.setOptions(options);
-		this.request(url);
-	},
-
-	request: function(url) {
-		this.url = url;
-		this.method = this.options.method;
-		var params = Object.clone(this.options.parameters);
-
-		if (!['get', 'post'].include(this.method)) {
-			// simulate other verbs over post
-			params['_method'] = this.method;
-			this.method = 'post';
-		}
-
-		this.parameters = params;
-
-		if (params = Hash.toQueryString(params)) {
-			// when GET, append parameters to URL
-			if (this.method == 'get')
-				this.url += (this.url.include('?') ? '&' : '?') + params;
-			else if (/Konqueror|Safari|KHTML/.test(navigator.userAgent))
-				params += '&_=';
-		}
-
-		try {
-			if (this.options.onCreate) this.options.onCreate(this.transport);
-			Ajax.Responders.dispatch('onCreate', this, this.transport);
-
-			this.transport.open(this.method.toUpperCase(), this.url,
-				this.options.asynchronous);
-
-			if (this.options.asynchronous)
-				setTimeout(function() { this.respondToReadyState(1) }.bind(this), 10);
-
-			this.transport.onreadystatechange = this.onStateChange.bind(this);
-			this.setRequestHeaders();
-
-			this.body = this.method == 'post' ? (this.options.postBody || params) : null;
-			this.transport.send(this.body);
-
-			/* Force Firefox to handle ready state 4 for synchronous requests */
-			if (!this.options.asynchronous && this.transport.overrideMimeType)
-				this.onStateChange();
-
-		}
-		catch (e) {
-			this.dispatchException(e);
-		}
-	},
-
-	onStateChange: function() {
-		var readyState = this.transport.readyState;
-		if (readyState > 1 && !((readyState == 4) && this._complete))
-			this.respondToReadyState(this.transport.readyState);
-	},
-
-	setRequestHeaders: function() {
-		var headers = {
-			'X-Requested-With': 'XMLHttpRequest',
-			'X-Prototype-Version': Prototype.Version,
-			'Accept': 'text/javascript, text/html, application/xml, text/xml, */*'
-		};
-
-		if (this.method == 'post') {
-			headers['Content-type'] = this.options.contentType +
-				(this.options.encoding ? '; charset=' + this.options.encoding : '');
-
-			/* Force "Connection: close" for older Mozilla browsers to work
-			 * around a bug where XMLHttpRequest sends an incorrect
-			 * Content-length header. See Mozilla Bugzilla #246651.
-			 */
-			if (this.transport.overrideMimeType &&
-					(navigator.userAgent.match(/Gecko\/(\d{4})/) || [0,2005])[1] < 2005)
-						headers['Connection'] = 'close';
-		}
-
-		// user-defined headers
-		if (typeof this.options.requestHeaders == 'object') {
-			var extras = this.options.requestHeaders;
-
-			if (typeof extras.push == 'function')
-				for (var i = 0, length = extras.length; i < length; i += 2)
-					headers[extras[i]] = extras[i+1];
-			else
-				$H(extras).each(function(pair) { headers[pair.key] = pair.value });
-		}
-
-		for (var name in headers)
-			this.transport.setRequestHeader(name, headers[name]);
-	},
-
-	success: function() {
-		return !this.transport.status
-				|| (this.transport.status >= 200 && this.transport.status < 300);
-	},
-
-	respondToReadyState: function(readyState) {
-		var state = Ajax.Request.Events[readyState];
-		var transport = this.transport, json = this.evalJSON();
-
-		if (state == 'Complete') {
-			try {
-				this._complete = true;
-				(this.options['on' + this.transport.status]
-				 || this.options['on' + (this.success() ? 'Success' : 'Failure')]
-				 || Prototype.emptyFunction)(transport, json);
-			} catch (e) {
-				this.dispatchException(e);
-			}
-
-			var contentType = this.getHeader('Content-type');
-			if (contentType && contentType.strip().
-				match(/^(text|application)\/(x-)?(java|ecma)script(;.*)?$/i))
-					this.evalResponse();
-		}
-
-		try {
-			(this.options['on' + state] || Prototype.emptyFunction)(transport, json);
-			Ajax.Responders.dispatch('on' + state, this, transport, json);
-		} catch (e) {
-			this.dispatchException(e);
-		}
-
-		if (state == 'Complete') {
-			// avoid memory leak in MSIE: clean up
-			this.transport.onreadystatechange = Prototype.emptyFunction;
-		}
-	},
-
-	getHeader: function(name) {
-		try {
-			return this.transport.getResponseHeader(name);
-		} catch (e) { return null }
-	},
-
-	evalJSON: function() {
-		try {
-			var json = this.getHeader('X-JSON');
-			return json ? json.evalJSON() : null;
-		} catch (e) { return null }
-	},
-
-	evalResponse: function() {
-		try {
-			return eval((this.transport.responseText || '').unfilterJSON());
-		} catch (e) {
-			this.dispatchException(e);
-		}
-	},
-
-	dispatchException: function(exception) {
-		(this.options.onException || Prototype.emptyFunction)(this, exception);
-		Ajax.Responders.dispatch('onException', this, exception);
-	}
+  ['Uninitialized', 'Loading', 'Loaded', 'Interactive', 'Complete'];
+
+Ajax.Response = Class.create({
+  initialize: function(request){
+    this.request = request;
+    var transport  = this.transport  = request.transport,
+        readyState = this.readyState = transport.readyState;
+
+    if((readyState > 2 && !Prototype.Browser.IE) || readyState == 4) {
+      this.status       = this.getStatus();
+      this.statusText   = this.getStatusText();
+      this.responseText = String.interpret(transport.responseText);
+      this.headerJSON   = this._getHeaderJSON();
+    }
+
+    if(readyState == 4) {
+      var xml = transport.responseXML;
+      this.responseXML  = Object.isUndefined(xml) ? null : xml;
+      this.responseJSON = this._getResponseJSON();
+    }
+  },
+
+  status:      0,
+  statusText: '',
+
+  getStatus: Ajax.Request.prototype.getStatus,
+
+  getStatusText: function() {
+    try {
+      return this.transport.statusText || '';
+    } catch (e) { return '' }
+  },
+
+  getHeader: Ajax.Request.prototype.getHeader,
+
+  getAllHeaders: function() {
+    try {
+      return this.getAllResponseHeaders();
+    } catch (e) { return null }
+  },
+
+  getResponseHeader: function(name) {
+    return this.transport.getResponseHeader(name);
+  },
+
+  getAllResponseHeaders: function() {
+    return this.transport.getAllResponseHeaders();
+  },
+
+  _getHeaderJSON: function() {
+    var json = this.getHeader('X-JSON');
+    if (!json) return null;
+    json = decodeURIComponent(escape(json));
+    try {
+      return json.evalJSON(this.request.options.sanitizeJSON ||
+        !this.request.isSameOrigin());
+    } catch (e) {
+      this.request.dispatchException(e);
+    }
+  },
+
+  _getResponseJSON: function() {
+    var options = this.request.options;
+    if (!options.evalJSON || (options.evalJSON != 'force' &&
+      !(this.getHeader('Content-type') || '').include('application/json')) ||
+        this.responseText.blank())
+          return null;
+    try {
+      return this.responseText.evalJSON(options.sanitizeJSON ||
+        !this.request.isSameOrigin());
+    } catch (e) {
+      this.request.dispatchException(e);
+    }
+  }
 });
 
-Ajax.Updater = Class.create();
-
-Object.extend(Object.extend(Ajax.Updater.prototype, Ajax.Request.prototype), {
-	initialize: function(container, url, options) {
-		this.container = {
-			success: (container.success || container),
-			failure: (container.failure || (container.success ? null : container))
-		}
-
-		this.transport = Ajax.getTransport();
-		this.setOptions(options);
-
-		var onComplete = this.options.onComplete || Prototype.emptyFunction;
-		this.options.onComplete = (function(transport, param) {
-			this.updateContent();
-			onComplete(transport, param);
-		}).bind(this);
-
-		this.request(url);
-	},
-
-	updateContent: function() {
-		var receiver = this.container[this.success() ? 'success' : 'failure'];
-		var response = this.transport.responseText;
-
-		if (!this.options.evalScripts) response = response.stripScripts();
-
-		if (receiver = $(receiver)) {
-			if (this.options.insertion)
-				new this.options.insertion(receiver, response);
-			else
-				receiver.update(response);
-		}
-
-		if (this.success()) {
-			if (this.onComplete)
-				setTimeout(this.onComplete.bind(this), 10);
-		}
-	}
+Ajax.Updater = Class.create(Ajax.Request, {
+  initialize: function($super, container, url, options) {
+    this.container = {
+      success: (container.success || container),
+      failure: (container.failure || (container.success ? null : container))
+    };
+
+    options = Object.clone(options);
+    var onComplete = options.onComplete;
+    options.onComplete = (function(response, json) {
+      this.updateContent(response.responseText);
+      if (Object.isFunction(onComplete)) onComplete(response, json);
+    }).bind(this);
+
+    $super(url, options);
+  },
+
+  updateContent: function(responseText) {
+    var receiver = this.container[this.success() ? 'success' : 'failure'],
+        options = this.options;
+
+    if (!options.evalScripts) responseText = responseText.stripScripts();
+
+    if (receiver = $(receiver)) {
+      if (options.insertion) {
+        if (Object.isString(options.insertion)) {
+          var insertion = { }; insertion[options.insertion] = responseText;
+          receiver.insert(insertion);
+        }
+        else options.insertion(receiver, responseText);
+      }
+      else receiver.update(responseText);
+    }
+  }
 });
 
-Ajax.PeriodicalUpdater = Class.create();
-Ajax.PeriodicalUpdater.prototype = Object.extend(new Ajax.Base(), {
-	initialize: function(container, url, options) {
-		this.setOptions(options);
-		this.onComplete = this.options.onComplete;
-
-		this.frequency = (this.options.frequency || 2);
-		this.decay = (this.options.decay || 1);
-
-		this.updater = {};
-		this.container = container;
-		this.url = url;
-
-		this.start();
-	},
-
-	start: function() {
-		this.options.onComplete = this.updateComplete.bind(this);
-		this.onTimerEvent();
-	},
-
-	stop: function() {
-		this.updater.options.onComplete = undefined;
-		clearTimeout(this.timer);
-		(this.onComplete || Prototype.emptyFunction).apply(this, arguments);
-	},
-
-	updateComplete: function(request) {
-		if (this.options.decay) {
-			this.decay = (request.responseText == this.lastText ?
-				this.decay * this.options.decay : 1);
-
-			this.lastText = request.responseText;
-		}
-		this.timer = setTimeout(this.onTimerEvent.bind(this),
-			this.decay * this.frequency * 1000);
-	},
-
-	onTimerEvent: function() {
-		this.updater = new Ajax.Updater(this.container, this.url, this.options);
-	}
+Ajax.PeriodicalUpdater = Class.create(Ajax.Base, {
+  initialize: function($super, container, url, options) {
+    $super(options);
+    this.onComplete = this.options.onComplete;
+
+    this.frequency = (this.options.frequency || 2);
+    this.decay = (this.options.decay || 1);
+
+    this.updater = { };
+    this.container = container;
+    this.url = url;
+
+    this.start();
+  },
+
+  start: function() {
+    this.options.onComplete = this.updateComplete.bind(this);
+    this.onTimerEvent();
+  },
+
+  stop: function() {
+    this.updater.options.onComplete = undefined;
+    clearTimeout(this.timer);
+    (this.onComplete || Prototype.emptyFunction).apply(this, arguments);
+  },
+
+  updateComplete: function(response) {
+    if (this.options.decay) {
+      this.decay = (response.responseText == this.lastText ?
+        this.decay * this.options.decay : 1);
+
+      this.lastText = response.responseText;
+    }
+    this.timer = this.onTimerEvent.bind(this).delay(this.decay * this.frequency);
+  },
+
+  onTimerEvent: function() {
+    this.updater = new Ajax.Updater(this.container, this.url, this.options);
+  }
 });
 function $(element) {
-	if (arguments.length > 1) {
-		for (var i = 0, elements = [], length = arguments.length; i < length; i++)
-			elements.push($(arguments[i]));
-		return elements;
-	}
-	if (typeof element == 'string')
-		element = document.getElementById(element);
-	return Element.extend(element);
+  if (arguments.length > 1) {
+    for (var i = 0, elements = [], length = arguments.length; i < length; i++)
+      elements.push($(arguments[i]));
+    return elements;
+  }
+  if (Object.isString(element))
+    element = document.getElementById(element);
+  return Element.extend(element);
 }
 
 if (Prototype.BrowserFeatures.XPath) {
-	document._getElementsByXPath = function(expression, parentElement) {
-		var results = [];
-		var query = document.evaluate(expression, $(parentElement) || document,
-			null, XPathResult.ORDERED_NODE_SNAPSHOT_TYPE, null);
-		for (var i = 0, length = query.snapshotLength; i < length; i++)
-			results.push(query.snapshotItem(i));
-		return results;
-	};
-
-	document.getElementsByClassName = function(className, parentElement) {
-		var q = ".//*[contains(concat(' ', @class, ' '), ' " + className + " ')]";
-		return document._getElementsByXPath(q, parentElement);
-	}
-
-} else document.getElementsByClassName = function(className, parentElement) {
-	var children = ($(parentElement) || document.body).getElementsByTagName('*');
-	var elements = [], child, pattern = new RegExp("(^|\\s)" + className + "(\\s|$)");
-	for (var i = 0, length = children.length; i < length; i++) {
-		child = children[i];
-		var elementClassName = child.className;
-		if (elementClassName.length == 0) continue;
-		if (elementClassName == className || elementClassName.match(pattern))
-			elements.push(Element.extend(child));
-	}
-	return elements;
-};
+  document._getElementsByXPath = function(expression, parentElement) {
+    var results = [];
+    var query = document.evaluate(expression, $(parentElement) || document,
+      null, XPathResult.ORDERED_NODE_SNAPSHOT_TYPE, null);
+    for (var i = 0, length = query.snapshotLength; i < length; i++)
+      results.push(Element.extend(query.snapshotItem(i)));
+    return results;
+  };
+}
 
 /*--------------------------------------------------------------------------*/
 
-if (!window.Element) var Element = {};
-
-Element.extend = function(element) {
-	var F = Prototype.BrowserFeatures;
-	if (!element || !element.tagName || element.nodeType == 3 ||
-	 element._extended || F.SpecificElementExtensions || element == window)
-		return element;
-
-	var methods = {}, tagName = element.tagName, cache = Element.extend.cache,
-	 T = Element.Methods.ByTag;
-
-	// extend methods for all tags (Safari doesn't need this)
-	if (!F.ElementExtensions) {
-		Object.extend(methods, Element.Methods),
-		Object.extend(methods, Element.Methods.Simulated);
-	}
-
-	// extend methods for specific tags
-	if (T[tagName]) Object.extend(methods, T[tagName]);
-
-	for (var property in methods) {
-		var value = methods[property];
-		if (typeof value == 'function' && !(property in element))
-			element[property] = cache.findOrStore(value);
-	}
-
-	element._extended = Prototype.emptyFunction;
-	return element;
-};
+if (!window.Node) var Node = { };
+
+if (!Node.ELEMENT_NODE) {
+  // DOM level 2 ECMAScript Language Binding
+  Object.extend(Node, {
+    ELEMENT_NODE: 1,
+    ATTRIBUTE_NODE: 2,
+    TEXT_NODE: 3,
+    CDATA_SECTION_NODE: 4,
+    ENTITY_REFERENCE_NODE: 5,
+    ENTITY_NODE: 6,
+    PROCESSING_INSTRUCTION_NODE: 7,
+    COMMENT_NODE: 8,
+    DOCUMENT_NODE: 9,
+    DOCUMENT_TYPE_NODE: 10,
+    DOCUMENT_FRAGMENT_NODE: 11,
+    NOTATION_NODE: 12
+  });
+}
 
-Element.extend.cache = {
-	findOrStore: function(value) {
-		return this[value] = this[value] || function() {
-			return value.apply(null, [this].concat($A(arguments)));
-		}
-	}
-};
+(function() {
+  var element = this.Element;
+  this.Element = function(tagName, attributes) {
+    attributes = attributes || { };
+    tagName = tagName.toLowerCase();
+    var cache = Element.cache;
+    if (Prototype.Browser.IE && attributes.name) {
+      tagName = '<' + tagName + ' name="' + attributes.name + '">';
+      delete attributes.name;
+      return Element.writeAttribute(document.createElement(tagName), attributes);
+    }
+    if (!cache[tagName]) cache[tagName] = Element.extend(document.createElement(tagName));
+    return Element.writeAttribute(cache[tagName].cloneNode(false), attributes);
+  };
+  Object.extend(this.Element, element || { });
+}).call(window);
+
+Element.cache = { };
 
 Element.Methods = {
-	visible: function(element) {
-		return $(element).style.display != 'none';
-	},
-
-	toggle: function(element) {
-		element = $(element);
-		Element[Element.visible(element) ? 'hide' : 'show'](element);
-		return element;
-	},
-
-	hide: function(element) {
-		$(element).style.display = 'none';
-		return element;
-	},
-
-	show: function(element) {
-		$(element).style.display = '';
-		return element;
-	},
-
-	remove: function(element) {
-		element = $(element);
-		element.parentNode.removeChild(element);
-		return element;
-	},
-
-	update: function(element, html) {
-		html = typeof html == 'undefined' ? '' : html.toString();
-		$(element).innerHTML = html.stripScripts();
-		setTimeout(function() {html.evalScripts()}, 10);
-		return element;
-	},
-
-	replace: function(element, html) {
-		element = $(element);
-		html = typeof html == 'undefined' ? '' : html.toString();
-		if (element.outerHTML) {
-			element.outerHTML = html.stripScripts();
-		} else {
-			var range = element.ownerDocument.createRange();
-			range.selectNodeContents(element);
-			element.parentNode.replaceChild(
-				range.createContextualFragment(html.stripScripts()), element);
-		}
-		setTimeout(function() {html.evalScripts()}, 10);
-		return element;
-	},
-
-	inspect: function(element) {
-		element = $(element);
-		var result = '<' + element.tagName.toLowerCase();
-		$H({'id': 'id', 'className': 'class'}).each(function(pair) {
-			var property = pair.first(), attribute = pair.last();
-			var value = (element[property] || '').toString();
-			if (value) result += ' ' + attribute + '=' + value.inspect(true);
-		});
-		return result + '>';
-	},
-
-	recursivelyCollect: function(element, property) {
-		element = $(element);
-		var elements = [];
-		while (element = element[property])
-			if (element.nodeType == 1)
-				elements.push(Element.extend(element));
-		return elements;
-	},
-
-	ancestors: function(element) {
-		return $(element).recursivelyCollect('parentNode');
-	},
-
-	descendants: function(element) {
-		return $A($(element).getElementsByTagName('*')).each(Element.extend);
-	},
-
-	firstDescendant: function(element) {
-		element = $(element).firstChild;
-		while (element && element.nodeType != 1) element = element.nextSibling;
-		return $(element);
-	},
-
-	immediateDescendants: function(element) {
-		if (!(element = $(element).firstChild)) return [];
-		while (element && element.nodeType != 1) element = element.nextSibling;
-		if (element) return [element].concat($(element).nextSiblings());
-		return [];
-	},
-
-	previousSiblings: function(element) {
-		return $(element).recursivelyCollect('previousSibling');
-	},
-
-	nextSiblings: function(element) {
-		return $(element).recursivelyCollect('nextSibling');
-	},
-
-	siblings: function(element) {
-		element = $(element);
-		return element.previousSiblings().reverse().concat(element.nextSiblings());
-	},
-
-	match: function(element, selector) {
-		if (typeof selector == 'string')
-			selector = new Selector(selector);
-		return selector.match($(element));
-	},
-
-	up: function(element, expression, index) {
-		element = $(element);
-		if (arguments.length == 1) return $(element.parentNode);
-		var ancestors = element.ancestors();
-		return expression ? Selector.findElement(ancestors, expression, index) :
-			ancestors[index || 0];
-	},
-
-	down: function(element, expression, index) {
-		element = $(element);
-		if (arguments.length == 1) return element.firstDescendant();
-		var descendants = element.descendants();
-		return expression ? Selector.findElement(descendants, expression, index) :
-			descendants[index || 0];
-	},
-
-	previous: function(element, expression, index) {
-		element = $(element);
-		if (arguments.length == 1) return $(Selector.handlers.previousElementSibling(element));
-		var previousSiblings = element.previousSiblings();
-		return expression ? Selector.findElement(previousSiblings, expression, index) :
-			previousSiblings[index || 0];
-	},
-
-	next: function(element, expression, index) {
-		element = $(element);
-		if (arguments.length == 1) return $(Selector.handlers.nextElementSibling(element));
-		var nextSiblings = element.nextSiblings();
-		return expression ? Selector.findElement(nextSiblings, expression, index) :
-			nextSiblings[index || 0];
-	},
-
-	getElementsBySelector: function() {
-		var args = $A(arguments), element = $(args.shift());
-		return Selector.findChildElements(element, args);
-	},
-
-	getElementsByClassName: function(element, className) {
-		return document.getElementsByClassName(className, element);
-	},
-
-	readAttribute: function(element, name) {
-		element = $(element);
-		if (Prototype.Browser.IE) {
-			if (!element.attributes) return null;
-			var t = Element._attributeTranslations;
-			if (t.values[name]) return t.values[name](element, name);
-			if (t.names[name])  name = t.names[name];
-			var attribute = element.attributes[name];
-			return attribute ? attribute.nodeValue : null;
-		}
-		return element.getAttribute(name);
-	},
-
-	getHeight: function(element) {
-		return $(element).getDimensions().height;
-	},
-
-	getWidth: function(element) {
-		return $(element).getDimensions().width;
-	},
-
-	classNames: function(element) {
-		return new Element.ClassNames(element);
-	},
-
-	hasClassName: function(element, className) {
-		if (!(element = $(element))) return;
-		var elementClassName = element.className;
-		if (elementClassName.length == 0) return false;
-		if (elementClassName == className ||
-				elementClassName.match(new RegExp("(^|\\s)" + className + "(\\s|$)")))
-			return true;
-		return false;
-	},
-
-	addClassName: function(element, className) {
-		if (!(element = $(element))) return;
-		Element.classNames(element).add(className);
-		return element;
-	},
-
-	removeClassName: function(element, className) {
-		if (!(element = $(element))) return;
-		Element.classNames(element).remove(className);
-		return element;
-	},
-
-	toggleClassName: function(element, className) {
-		if (!(element = $(element))) return;
-		Element.classNames(element)[element.hasClassName(className) ? 'remove' : 'add'](className);
-		return element;
-	},
-
-	observe: function() {
-		Event.observe.apply(Event, arguments);
-		return $A(arguments).first();
-	},
-
-	stopObserving: function() {
-		Event.stopObserving.apply(Event, arguments);
-		return $A(arguments).first();
-	},
-
-	// removes whitespace-only text node children
-	cleanWhitespace: function(element) {
-		element = $(element);
-		var node = element.firstChild;
-		while (node) {
-			var nextNode = node.nextSibling;
-			if (node.nodeType == 3 && !/\S/.test(node.nodeValue))
-				element.removeChild(node);
-			node = nextNode;
-		}
-		return element;
-	},
-
-	empty: function(element) {
-		return $(element).innerHTML.blank();
-	},
-
-	descendantOf: function(element, ancestor) {
-		element = $(element), ancestor = $(ancestor);
-		while (element = element.parentNode)
-			if (element == ancestor) return true;
-		return false;
-	},
-
-	scrollTo: function(element) {
-		element = $(element);
-		var pos = Position.cumulativeOffset(element);
-		window.scrollTo(pos[0], pos[1]);
-		return element;
-	},
-
-	getStyle: function(element, style) {
-		element = $(element);
-		style = style == 'float' ? 'cssFloat' : style.camelize();
-		var value = element.style[style];
-		if (!value) {
-			var css = document.defaultView.getComputedStyle(element, null);
-			value = css ? css[style] : null;
-		}
-		if (style == 'opacity') return value ? parseFloat(value) : 1.0;
-		return value == 'auto' ? null : value;
-	},
-
-	getOpacity: function(element) {
-		return $(element).getStyle('opacity');
-	},
-
-	setStyle: function(element, styles, camelized) {
-		element = $(element);
-		var elementStyle = element.style;
-
-		for (var property in styles)
-			if (property == 'opacity') element.setOpacity(styles[property])
-			else
-				elementStyle[(property == 'float' || property == 'cssFloat') ?
-					(elementStyle.styleFloat === undefined ? 'cssFloat' : 'styleFloat') :
-					(camelized ? property : property.camelize())] = styles[property];
-
-		return element;
-	},
-
-	setOpacity: function(element, value) {
-		element = $(element);
-		element.style.opacity = (value == 1 || value === '') ? '' :
-			(value < 0.00001) ? 0 : value;
-		return element;
-	},
-
-	getDimensions: function(element) {
-		element = $(element);
-		var display = $(element).getStyle('display');
-		if (display != 'none' && display != null) // Safari bug
-			return {width: element.offsetWidth, height: element.offsetHeight};
-
-		// All *Width and *Height properties give 0 on elements with display none,
-		// so enable the element temporarily
-		var els = element.style;
-		var originalVisibility = els.visibility;
-		var originalPosition = els.position;
-		var originalDisplay = els.display;
-		els.visibility = 'hidden';
-		els.position = 'absolute';
-		els.display = 'block';
-		var originalWidth = element.clientWidth;
-		var originalHeight = element.clientHeight;
-		els.display = originalDisplay;
-		els.position = originalPosition;
-		els.visibility = originalVisibility;
-		return {width: originalWidth, height: originalHeight};
-	},
-
-	makePositioned: function(element) {
-		element = $(element);
-		var pos = Element.getStyle(element, 'position');
-		if (pos == 'static' || !pos) {
-			element._madePositioned = true;
-			element.style.position = 'relative';
-			// Opera returns the offset relative to the positioning context, when an
-			// element is position relative but top and left have not been defined
-			if (window.opera) {
-				element.style.top = 0;
-				element.style.left = 0;
-			}
-		}
-		return element;
-	},
-
-	undoPositioned: function(element) {
-		element = $(element);
-		if (element._madePositioned) {
-			element._madePositioned = undefined;
-			element.style.position =
-				element.style.top =
-				element.style.left =
-				element.style.bottom =
-				element.style.right = '';
-		}
-		return element;
-	},
-
-	makeClipping: function(element) {
-		element = $(element);
-		if (element._overflow) return element;
-		element._overflow = element.style.overflow || 'auto';
-		if ((Element.getStyle(element, 'overflow') || 'visible') != 'hidden')
-			element.style.overflow = 'hidden';
-		return element;
-	},
-
-	undoClipping: function(element) {
-		element = $(element);
-		if (!element._overflow) return element;
-		element.style.overflow = element._overflow == 'auto' ? '' : element._overflow;
-		element._overflow = null;
-		return element;
-	}
+  visible: function(element) {
+    return $(element).style.display != 'none';
+  },
+
+  toggle: function(element) {
+    element = $(element);
+    Element[Element.visible(element) ? 'hide' : 'show'](element);
+    return element;
+  },
+
+  hide: function(element) {
+    $(element).style.display = 'none';
+    return element;
+  },
+
+  show: function(element) {
+    $(element).style.display = '';
+    return element;
+  },
+
+  remove: function(element) {
+    element = $(element);
+    element.parentNode.removeChild(element);
+    return element;
+  },
+
+  update: function(element, content) {
+    element = $(element);
+    if (content && content.toElement) content = content.toElement();
+    if (Object.isElement(content)) return element.update().insert(content);
+    content = Object.toHTML(content);
+    element.innerHTML = content.stripScripts();
+    content.evalScripts.bind(content).defer();
+    return element;
+  },
+
+  replace: function(element, content) {
+    element = $(element);
+    if (content && content.toElement) content = content.toElement();
+    else if (!Object.isElement(content)) {
+      content = Object.toHTML(content);
+      var range = element.ownerDocument.createRange();
+      range.selectNode(element);
+      content.evalScripts.bind(content).defer();
+      content = range.createContextualFragment(content.stripScripts());
+    }
+    element.parentNode.replaceChild(content, element);
+    return element;
+  },
+
+  insert: function(element, insertions) {
+    element = $(element);
+
+    if (Object.isString(insertions) || Object.isNumber(insertions) ||
+        Object.isElement(insertions) || (insertions && (insertions.toElement || insertions.toHTML)))
+          insertions = {bottom:insertions};
+
+    var content, insert, tagName, childNodes;
+
+    for (var position in insertions) {
+      content  = insertions[position];
+      position = position.toLowerCase();
+      insert = Element._insertionTranslations[position];
+
+      if (content && content.toElement) content = content.toElement();
+      if (Object.isElement(content)) {
+        insert(element, content);
+        continue;
+      }
+
+      content = Object.toHTML(content);
+
+      tagName = ((position == 'before' || position == 'after')
+        ? element.parentNode : element).tagName.toUpperCase();
+
+      childNodes = Element._getContentFromAnonymousElement(tagName, content.stripScripts());
+
+      if (position == 'top' || position == 'after') childNodes.reverse();
+      childNodes.each(insert.curry(element));
+
+      content.evalScripts.bind(content).defer();
+    }
+
+    return element;
+  },
+
+  wrap: function(element, wrapper, attributes) {
+    element = $(element);
+    if (Object.isElement(wrapper))
+      $(wrapper).writeAttribute(attributes || { });
+    else if (Object.isString(wrapper)) wrapper = new Element(wrapper, attributes);
+    else wrapper = new Element('div', wrapper);
+    if (element.parentNode)
+      element.parentNode.replaceChild(wrapper, element);
+    wrapper.appendChild(element);
+    return wrapper;
+  },
+
+  inspect: function(element) {
+    element = $(element);
+    var result = '<' + element.tagName.toLowerCase();
+    $H({'id': 'id', 'className': 'class'}).each(function(pair) {
+      var property = pair.first(), attribute = pair.last();
+      var value = (element[property] || '').toString();
+      if (value) result += ' ' + attribute + '=' + value.inspect(true);
+    });
+    return result + '>';
+  },
+
+  recursivelyCollect: function(element, property) {
+    element = $(element);
+    var elements = [];
+    while (element = element[property])
+      if (element.nodeType == 1)
+        elements.push(Element.extend(element));
+    return elements;
+  },
+
+  ancestors: function(element) {
+    return $(element).recursivelyCollect('parentNode');
+  },
+
+  descendants: function(element) {
+    return $(element).select("*");
+  },
+
+  firstDescendant: function(element) {
+    element = $(element).firstChild;
+    while (element && element.nodeType != 1) element = element.nextSibling;
+    return $(element);
+  },
+
+  immediateDescendants: function(element) {
+    if (!(element = $(element).firstChild)) return [];
+    while (element && element.nodeType != 1) element = element.nextSibling;
+    if (element) return [element].concat($(element).nextSiblings());
+    return [];
+  },
+
+  previousSiblings: function(element) {
+    return $(element).recursivelyCollect('previousSibling');
+  },
+
+  nextSiblings: function(element) {
+    return $(element).recursivelyCollect('nextSibling');
+  },
+
+  siblings: function(element) {
+    element = $(element);
+    return element.previousSiblings().reverse().concat(element.nextSiblings());
+  },
+
+  match: function(element, selector) {
+    if (Object.isString(selector))
+      selector = new Selector(selector);
+    return selector.match($(element));
+  },
+
+  up: function(element, expression, index) {
+    element = $(element);
+    if (arguments.length == 1) return $(element.parentNode);
+    var ancestors = element.ancestors();
+    return Object.isNumber(expression) ? ancestors[expression] :
+      Selector.findElement(ancestors, expression, index);
+  },
+
+  down: function(element, expression, index) {
+    element = $(element);
+    if (arguments.length == 1) return element.firstDescendant();
+    return Object.isNumber(expression) ? element.descendants()[expression] :
+      element.select(expression)[index || 0];
+  },
+
+  previous: function(element, expression, index) {
+    element = $(element);
+    if (arguments.length == 1) return $(Selector.handlers.previousElementSibling(element));
+    var previousSiblings = element.previousSiblings();
+    return Object.isNumber(expression) ? previousSiblings[expression] :
+      Selector.findElement(previousSiblings, expression, index);
+  },
+
+  next: function(element, expression, index) {
+    element = $(element);
+    if (arguments.length == 1) return $(Selector.handlers.nextElementSibling(element));
+    var nextSiblings = element.nextSiblings();
+    return Object.isNumber(expression) ? nextSiblings[expression] :
+      Selector.findElement(nextSiblings, expression, index);
+  },
+
+  select: function() {
+    var args = $A(arguments), element = $(args.shift());
+    return Selector.findChildElements(element, args);
+  },
+
+  adjacent: function() {
+    var args = $A(arguments), element = $(args.shift());
+    return Selector.findChildElements(element.parentNode, args).without(element);
+  },
+
+  identify: function(element) {
+    element = $(element);
+    var id = element.readAttribute('id'), self = arguments.callee;
+    if (id) return id;
+    do { id = 'anonymous_element_' + self.counter++ } while ($(id));
+    element.writeAttribute('id', id);
+    return id;
+  },
+
+  readAttribute: function(element, name) {
+    element = $(element);
+    if (Prototype.Browser.IE) {
+      var t = Element._attributeTranslations.read;
+      if (t.values[name]) return t.values[name](element, name);
+      if (t.names[name]) name = t.names[name];
+      if (name.include(':')) {
+        return (!element.attributes || !element.attributes[name]) ? null :
+         element.attributes[name].value;
+      }
+    }
+    return element.getAttribute(name);
+  },
+
+  writeAttribute: function(element, name, value) {
+    element = $(element);
+    var attributes = { }, t = Element._attributeTranslations.write;
+
+    if (typeof name == 'object') attributes = name;
+    else attributes[name] = Object.isUndefined(value) ? true : value;
+
+    for (var attr in attributes) {
+      name = t.names[attr] || attr;
+      value = attributes[attr];
+      if (t.values[attr]) name = t.values[attr](element, value);
+      if (value === false || value === null)
+        element.removeAttribute(name);
+      else if (value === true)
+        element.setAttribute(name, name);
+      else element.setAttribute(name, value);
+    }
+    return element;
+  },
+
+  getHeight: function(element) {
+    return $(element).getDimensions().height;
+  },
+
+  getWidth: function(element) {
+    return $(element).getDimensions().width;
+  },
+
+  classNames: function(element) {
+    return new Element.ClassNames(element);
+  },
+
+  hasClassName: function(element, className) {
+    if (!(element = $(element))) return;
+    var elementClassName = element.className;
+    return (elementClassName.length > 0 && (elementClassName == className ||
+      new RegExp("(^|\\s)" + className + "(\\s|$)").test(elementClassName)));
+  },
+
+  addClassName: function(element, className) {
+    if (!(element = $(element))) return;
+    if (!element.hasClassName(className))
+      element.className += (element.className ? ' ' : '') + className;
+    return element;
+  },
+
+  removeClassName: function(element, className) {
+    if (!(element = $(element))) return;
+    element.className = element.className.replace(
+      new RegExp("(^|\\s+)" + className + "(\\s+|$)"), ' ').strip();
+    return element;
+  },
+
+  toggleClassName: function(element, className) {
+    if (!(element = $(element))) return;
+    return element[element.hasClassName(className) ?
+      'removeClassName' : 'addClassName'](className);
+  },
+
+  // removes whitespace-only text node children
+  cleanWhitespace: function(element) {
+    element = $(element);
+    var node = element.firstChild;
+    while (node) {
+      var nextNode = node.nextSibling;
+      if (node.nodeType == 3 && !/\S/.test(node.nodeValue))
+        element.removeChild(node);
+      node = nextNode;
+    }
+    return element;
+  },
+
+  empty: function(element) {
+    return $(element).innerHTML.blank();
+  },
+
+  descendantOf: function(element, ancestor) {
+    element = $(element), ancestor = $(ancestor);
+    var originalAncestor = ancestor;
+
+    if (element.compareDocumentPosition)
+      return (element.compareDocumentPosition(ancestor) & 8) === 8;
+
+    if (element.sourceIndex && !Prototype.Browser.Opera) {
+      var e = element.sourceIndex, a = ancestor.sourceIndex,
+       nextAncestor = ancestor.nextSibling;
+      if (!nextAncestor) {
+        do { ancestor = ancestor.parentNode; }
+        while (!(nextAncestor = ancestor.nextSibling) && ancestor.parentNode);
+      }
+      if (nextAncestor && nextAncestor.sourceIndex)
+       return (e > a && e < nextAncestor.sourceIndex);
+    }
+
+    while (element = element.parentNode)
+      if (element == originalAncestor) return true;
+    return false;
+  },
+
+  scrollTo: function(element) {
+    element = $(element);
+    var pos = element.cumulativeOffset();
+    window.scrollTo(pos[0], pos[1]);
+    return element;
+  },
+
+  getStyle: function(element, style) {
+    element = $(element);
+    style = style == 'float' ? 'cssFloat' : style.camelize();
+    var value = element.style[style];
+    if (!value) {
+      var css = document.defaultView.getComputedStyle(element, null);
+      value = css ? css[style] : null;
+    }
+    if (style == 'opacity') return value ? parseFloat(value) : 1.0;
+    return value == 'auto' ? null : value;
+  },
+
+  getOpacity: function(element) {
+    return $(element).getStyle('opacity');
+  },
+
+  setStyle: function(element, styles) {
+    element = $(element);
+    var elementStyle = element.style, match;
+    if (Object.isString(styles)) {
+      element.style.cssText += ';' + styles;
+      return styles.include('opacity') ?
+        element.setOpacity(styles.match(/opacity:\s*(\d?\.?\d*)/)[1]) : element;
+    }
+    for (var property in styles)
+      if (property == 'opacity') element.setOpacity(styles[property]);
+      else
+        elementStyle[(property == 'float' || property == 'cssFloat') ?
+          (Object.isUndefined(elementStyle.styleFloat) ? 'cssFloat' : 'styleFloat') :
+            property] = styles[property];
+
+    return element;
+  },
+
+  setOpacity: function(element, value) {
+    element = $(element);
+    element.style.opacity = (value == 1 || value === '') ? '' :
+      (value < 0.00001) ? 0 : value;
+    return element;
+  },
+
+  getDimensions: function(element) {
+    element = $(element);
+    var display = $(element).getStyle('display');
+    if (display != 'none' && display != null) // Safari bug
+      return {width: element.offsetWidth, height: element.offsetHeight};
+
+    // All *Width and *Height properties give 0 on elements with display none,
+    // so enable the element temporarily
+    var els = element.style;
+    var originalVisibility = els.visibility;
+    var originalPosition = els.position;
+    var originalDisplay = els.display;
+    els.visibility = 'hidden';
+    els.position = 'absolute';
+    els.display = 'block';
+    var originalWidth = element.clientWidth;
+    var originalHeight = element.clientHeight;
+    els.display = originalDisplay;
+    els.position = originalPosition;
+    els.visibility = originalVisibility;
+    return {width: originalWidth, height: originalHeight};
+  },
+
+  makePositioned: function(element) {
+    element = $(element);
+    var pos = Element.getStyle(element, 'position');
+    if (pos == 'static' || !pos) {
+      element._madePositioned = true;
+      element.style.position = 'relative';
+      // Opera returns the offset relative to the positioning context, when an
+      // element is position relative but top and left have not been defined
+      if (window.opera) {
+        element.style.top = 0;
+        element.style.left = 0;
+      }
+    }
+    return element;
+  },
+
+  undoPositioned: function(element) {
+    element = $(element);
+    if (element._madePositioned) {
+      element._madePositioned = undefined;
+      element.style.position =
+        element.style.top =
+        element.style.left =
+        element.style.bottom =
+        element.style.right = '';
+    }
+    return element;
+  },
+
+  makeClipping: function(element) {
+    element = $(element);
+    if (element._overflow) return element;
+    element._overflow = Element.getStyle(element, 'overflow') || 'auto';
+    if (element._overflow !== 'hidden')
+      element.style.overflow = 'hidden';
+    return element;
+  },
+
+  undoClipping: function(element) {
+    element = $(element);
+    if (!element._overflow) return element;
+    element.style.overflow = element._overflow == 'auto' ? '' : element._overflow;
+    element._overflow = null;
+    return element;
+  },
+
+  cumulativeOffset: function(element) {
+    var valueT = 0, valueL = 0;
+    do {
+      valueT += element.offsetTop  || 0;
+      valueL += element.offsetLeft || 0;
+      element = element.offsetParent;
+    } while (element);
+    return Element._returnOffset(valueL, valueT);
+  },
+
+  positionedOffset: function(element) {
+    var valueT = 0, valueL = 0;
+    do {
+      valueT += element.offsetTop  || 0;
+      valueL += element.offsetLeft || 0;
+      element = element.offsetParent;
+      if (element) {
+        if (element.tagName == 'BODY') break;
+        var p = Element.getStyle(element, 'position');
+        if (p !== 'static') break;
+      }
+    } while (element);
+    return Element._returnOffset(valueL, valueT);
+  },
+
+  absolutize: function(element) {
+    element = $(element);
+    if (element.getStyle('position') == 'absolute') return;
+    // Position.prepare(); // To be done manually by Scripty when it needs it.
+
+    var offsets = element.positionedOffset();
+    var top     = offsets[1];
+    var left    = offsets[0];
+    var width   = element.clientWidth;
+    var height  = element.clientHeight;
+
+    element._originalLeft   = left - parseFloat(element.style.left  || 0);
+    element._originalTop    = top  - parseFloat(element.style.top || 0);
+    element._originalWidth  = element.style.width;
+    element._originalHeight = element.style.height;
+
+    element.style.position = 'absolute';
+    element.style.top    = top + 'px';
+    element.style.left   = left + 'px';
+    element.style.width  = width + 'px';
+    element.style.height = height + 'px';
+    return element;
+  },
+
+  relativize: function(element) {
+    element = $(element);
+    if (element.getStyle('position') == 'relative') return;
+    // Position.prepare(); // To be done manually by Scripty when it needs it.
+
+    element.style.position = 'relative';
+    var top  = parseFloat(element.style.top  || 0) - (element._originalTop || 0);
+    var left = parseFloat(element.style.left || 0) - (element._originalLeft || 0);
+
+    element.style.top    = top + 'px';
+    element.style.left   = left + 'px';
+    element.style.height = element._originalHeight;
+    element.style.width  = element._originalWidth;
+    return element;
+  },
+
+  cumulativeScrollOffset: function(element) {
+    var valueT = 0, valueL = 0;
+    do {
+      valueT += element.scrollTop  || 0;
+      valueL += element.scrollLeft || 0;
+      element = element.parentNode;
+    } while (element);
+    return Element._returnOffset(valueL, valueT);
+  },
+
+  getOffsetParent: function(element) {
+    if (element.offsetParent) return $(element.offsetParent);
+    if (element == document.body) return $(element);
+
+    while ((element = element.parentNode) && element != document.body)
+      if (Element.getStyle(element, 'position') != 'static')
+        return $(element);
+
+    return $(document.body);
+  },
+
+  viewportOffset: function(forElement) {
+    var valueT = 0, valueL = 0;
+
+    var element = forElement;
+    do {
+      valueT += element.offsetTop  || 0;
+      valueL += element.offsetLeft || 0;
+
+      // Safari fix
+      if (element.offsetParent == document.body &&
+        Element.getStyle(element, 'position') == 'absolute') break;
+
+    } while (element = element.offsetParent);
+
+    element = forElement;
+    do {
+      if (!Prototype.Browser.Opera || element.tagName == 'BODY') {
+        valueT -= element.scrollTop  || 0;
+        valueL -= element.scrollLeft || 0;
+      }
+    } while (element = element.parentNode);
+
+    return Element._returnOffset(valueL, valueT);
+  },
+
+  clonePosition: function(element, source) {
+    var options = Object.extend({
+      setLeft:    true,
+      setTop:     true,
+      setWidth:   true,
+      setHeight:  true,
+      offsetTop:  0,
+      offsetLeft: 0
+    }, arguments[2] || { });
+
+    // find page position of source
+    source = $(source);
+    var p = source.viewportOffset();
+
+    // find coordinate system to use
+    element = $(element);
+    var delta = [0, 0];
+    var parent = null;
+    // delta [0,0] will do fine with position: fixed elements,
+    // position:absolute needs offsetParent deltas
+    if (Element.getStyle(element, 'position') == 'absolute') {
+      parent = element.getOffsetParent();
+      delta = parent.viewportOffset();
+    }
+
+    // correct by body offsets (fixes Safari)
+    if (parent == document.body) {
+      delta[0] -= document.body.offsetLeft;
+      delta[1] -= document.body.offsetTop;
+    }
+
+    // set position
+    if (options.setLeft)   element.style.left  = (p[0] - delta[0] + options.offsetLeft) + 'px';
+    if (options.setTop)    element.style.top   = (p[1] - delta[1] + options.offsetTop) + 'px';
+    if (options.setWidth)  element.style.width = source.offsetWidth + 'px';
+    if (options.setHeight) element.style.height = source.offsetHeight + 'px';
+    return element;
+  }
 };
 
+Element.Methods.identify.counter = 1;
+
 Object.extend(Element.Methods, {
-	childOf: Element.Methods.descendantOf,
-	childElements: Element.Methods.immediateDescendants
+  getElementsBySelector: Element.Methods.select,
+  childElements: Element.Methods.immediateDescendants
 });
 
+Element._attributeTranslations = {
+  write: {
+    names: {
+      className: 'class',
+      htmlFor:   'for'
+    },
+    values: { }
+  }
+};
+
 if (Prototype.Browser.Opera) {
-	Element.Methods._getStyle = Element.Methods.getStyle;
-	Element.Methods.getStyle = function(element, style) {
-		switch(style) {
-			case 'left':
-			case 'top':
-			case 'right':
-			case 'bottom':
-				if (Element._getStyle(element, 'position') == 'static') return null;
-			default: return Element._getStyle(element, style);
-		}
-	};
+  Element.Methods.getStyle = Element.Methods.getStyle.wrap(
+    function(proceed, element, style) {
+      switch (style) {
+        case 'left': case 'top': case 'right': case 'bottom':
+          if (proceed(element, 'position') === 'static') return null;
+        case 'height': case 'width':
+          // returns '0px' for hidden elements; we want it to return null
+          if (!Element.visible(element)) return null;
+
+          // returns the border-box dimensions rather than the content-box
+          // dimensions, so we subtract padding and borders from the value
+          var dim = parseInt(proceed(element, style), 10);
+
+          if (dim !== element['offset' + style.capitalize()])
+            return dim + 'px';
+
+          var properties;
+          if (style === 'height') {
+            properties = ['border-top-width', 'padding-top',
+             'padding-bottom', 'border-bottom-width'];
+          }
+          else {
+            properties = ['border-left-width', 'padding-left',
+             'padding-right', 'border-right-width'];
+          }
+          return properties.inject(dim, function(memo, property) {
+            var val = proceed(element, property);
+            return val === null ? memo : memo - parseInt(val, 10);
+          }) + 'px';
+        default: return proceed(element, style);
+      }
+    }
+  );
+
+  Element.Methods.readAttribute = Element.Methods.readAttribute.wrap(
+    function(proceed, element, attribute) {
+      if (attribute === 'title') return element.title;
+      return proceed(element, attribute);
+    }
+  );
 }
+
 else if (Prototype.Browser.IE) {
-	Element.Methods.getStyle = function(element, style) {
-		element = $(element);
-		style = (style == 'float' || style == 'cssFloat') ? 'styleFloat' : style.camelize();
-		var value = element.style[style];
-		if (!value && element.currentStyle) value = element.currentStyle[style];
-
-		if (style == 'opacity') {
-			if (value = (element.getStyle('filter') || '').match(/alpha\(opacity=(.*)\)/))
-				if (value[1]) return parseFloat(value[1]) / 100;
-			return 1.0;
-		}
-
-		if (value == 'auto') {
-			if ((style == 'width' || style == 'height') && (element.getStyle('display') != 'none'))
-				return element['offset'+style.capitalize()] + 'px';
-			return null;
-		}
-		return value;
-	};
-
-	Element.Methods.setOpacity = function(element, value) {
-		element = $(element);
-		var filter = element.getStyle('filter'), style = element.style;
-		if (value == 1 || value === '') {
-			style.filter = filter.replace(/alpha\([^\)]*\)/gi,'');
-			return element;
-		} else if (value < 0.00001) value = 0;
-		style.filter = filter.replace(/alpha\([^\)]*\)/gi, '') +
-			'alpha(opacity=' + (value * 100) + ')';
-		return element;
-	};
-
-	// IE is missing .innerHTML support for TABLE-related elements
-	Element.Methods.update = function(element, html) {
-		element = $(element);
-		html = typeof html == 'undefined' ? '' : html.toString();
-		var tagName = element.tagName.toUpperCase();
-		if (['THEAD','TBODY','TR','TD'].include(tagName)) {
-			var div = document.createElement('div');
-			switch (tagName) {
-				case 'THEAD':
-				case 'TBODY':
-					div.innerHTML = '<table><tbody>' +  html.stripScripts() + '</tbody></table>';
-					depth = 2;
-					break;
-				case 'TR':
-					div.innerHTML = '<table><tbody><tr>' +  html.stripScripts() + '</tr></tbody></table>';
-					depth = 3;
-					break;
-				case 'TD':
-					div.innerHTML = '<table><tbody><tr><td>' +  html.stripScripts() + '</td></tr></tbody></table>';
-					depth = 4;
-			}
-			$A(element.childNodes).each(function(node) { element.removeChild(node) });
-			depth.times(function() { div = div.firstChild });
-			$A(div.childNodes).each(function(node) { element.appendChild(node) });
-		} else {
-			element.innerHTML = html.stripScripts();
-		}
-		setTimeout(function() { html.evalScripts() }, 10);
-		return element;
-	}
+  // IE doesn't report offsets correctly for static elements, so we change them
+  // to "relative" to get the values, then change them back.
+  Element.Methods.getOffsetParent = Element.Methods.getOffsetParent.wrap(
+    function(proceed, element) {
+      element = $(element);
+      var position = element.getStyle('position');
+      if (position !== 'static') return proceed(element);
+      element.setStyle({ position: 'relative' });
+      var value = proceed(element);
+      element.setStyle({ position: position });
+      return value;
+    }
+  );
+
+  $w('positionedOffset viewportOffset').each(function(method) {
+    Element.Methods[method] = Element.Methods[method].wrap(
+      function(proceed, element) {
+        element = $(element);
+        var position = element.getStyle('position');
+        if (position !== 'static') return proceed(element);
+        // Trigger hasLayout on the offset parent so that IE6 reports
+        // accurate offsetTop and offsetLeft values for position: fixed.
+        var offsetParent = element.getOffsetParent();
+        if (offsetParent && offsetParent.getStyle('position') === 'fixed')
+          offsetParent.setStyle({ zoom: 1 });
+        element.setStyle({ position: 'relative' });
+        var value = proceed(element);
+        element.setStyle({ position: position });
+        return value;
+      }
+    );
+  });
+
+  Element.Methods.getStyle = function(element, style) {
+    element = $(element);
+    style = (style == 'float' || style == 'cssFloat') ? 'styleFloat' : style.camelize();
+    var value = element.style[style];
+    if (!value && element.currentStyle) value = element.currentStyle[style];
+
+    if (style == 'opacity') {
+      if (value = (element.getStyle('filter') || '').match(/alpha\(opacity=(.*)\)/))
+        if (value[1]) return parseFloat(value[1]) / 100;
+      return 1.0;
+    }
+
+    if (value == 'auto') {
+      if ((style == 'width' || style == 'height') && (element.getStyle('display') != 'none'))
+        return element['offset' + style.capitalize()] + 'px';
+      return null;
+    }
+    return value;
+  };
+
+  Element.Methods.setOpacity = function(element, value) {
+    function stripAlpha(filter){
+      return filter.replace(/alpha\([^\)]*\)/gi,'');
+    }
+    element = $(element);
+    var currentStyle = element.currentStyle;
+    if ((currentStyle && !currentStyle.hasLayout) ||
+      (!currentStyle && element.style.zoom == 'normal'))
+        element.style.zoom = 1;
+
+    var filter = element.getStyle('filter'), style = element.style;
+    if (value == 1 || value === '') {
+      (filter = stripAlpha(filter)) ?
+        style.filter = filter : style.removeAttribute('filter');
+      return element;
+    } else if (value < 0.00001) value = 0;
+    style.filter = stripAlpha(filter) +
+      'alpha(opacity=' + (value * 100) + ')';
+    return element;
+  };
+
+  Element._attributeTranslations = {
+    read: {
+      names: {
+        'class': 'className',
+        'for':   'htmlFor'
+      },
+      values: {
+        _getAttr: function(element, attribute) {
+          return element.getAttribute(attribute, 2);
+        },
+        _getAttrNode: function(element, attribute) {
+          var node = element.getAttributeNode(attribute);
+          return node ? node.value : "";
+        },
+        _getEv: function(element, attribute) {
+          attribute = element.getAttribute(attribute);
+          return attribute ? attribute.toString().slice(23, -2) : null;
+        },
+        _flag: function(element, attribute) {
+          return $(element).hasAttribute(attribute) ? attribute : null;
+        },
+        style: function(element) {
+          return element.style.cssText.toLowerCase();
+        },
+        title: function(element) {
+          return element.title;
+        }
+      }
+    }
+  };
+
+  Element._attributeTranslations.write = {
+    names: Object.extend({
+      cellpadding: 'cellPadding',
+      cellspacing: 'cellSpacing'
+    }, Element._attributeTranslations.read.names),
+    values: {
+      checked: function(element, value) {
+        element.checked = !!value;
+      },
+
+      style: function(element, value) {
+        element.style.cssText = value ? value : '';
+      }
+    }
+  };
+
+  Element._attributeTranslations.has = {};
+
+  $w('colSpan rowSpan vAlign dateTime accessKey tabIndex ' +
+      'encType maxLength readOnly longDesc').each(function(attr) {
+    Element._attributeTranslations.write.names[attr.toLowerCase()] = attr;
+    Element._attributeTranslations.has[attr.toLowerCase()] = attr;
+  });
+
+  (function(v) {
+    Object.extend(v, {
+      href:        v._getAttr,
+      src:         v._getAttr,
+      type:        v._getAttr,
+      action:      v._getAttrNode,
+      disabled:    v._flag,
+      checked:     v._flag,
+      readonly:    v._flag,
+      multiple:    v._flag,
+      onload:      v._getEv,
+      onunload:    v._getEv,
+      onclick:     v._getEv,
+      ondblclick:  v._getEv,
+      onmousedown: v._getEv,
+      onmouseup:   v._getEv,
+      onmouseover: v._getEv,
+      onmousemove: v._getEv,
+      onmouseout:  v._getEv,
+      onfocus:     v._getEv,
+      onblur:      v._getEv,
+      onkeypress:  v._getEv,
+      onkeydown:   v._getEv,
+      onkeyup:     v._getEv,
+      onsubmit:    v._getEv,
+      onreset:     v._getEv,
+      onselect:    v._getEv,
+      onchange:    v._getEv
+    });
+  })(Element._attributeTranslations.read.values);
 }
-else if (Prototype.Browser.Gecko) {
-	Element.Methods.setOpacity = function(element, value) {
-		element = $(element);
-		element.style.opacity = (value == 1) ? 0.999999 :
-			(value === '') ? '' : (value < 0.00001) ? 0 : value;
-		return element;
-	};
+
+else if (Prototype.Browser.Gecko && /rv:1\.8\.0/.test(navigator.userAgent)) {
+  Element.Methods.setOpacity = function(element, value) {
+    element = $(element);
+    element.style.opacity = (value == 1) ? 0.999999 :
+      (value === '') ? '' : (value < 0.00001) ? 0 : value;
+    return element;
+  };
 }
 
-Element._attributeTranslations = {
-	names: {
-		colspan:   "colSpan",
-		rowspan:   "rowSpan",
-		valign:    "vAlign",
-		datetime:  "dateTime",
-		accesskey: "accessKey",
-		tabindex:  "tabIndex",
-		enctype:   "encType",
-		maxlength: "maxLength",
-		readonly:  "readOnly",
-		longdesc:  "longDesc"
-	},
-	values: {
-		_getAttr: function(element, attribute) {
-			return element.getAttribute(attribute, 2);
-		},
-		_flag: function(element, attribute) {
-			return $(element).hasAttribute(attribute) ? attribute : null;
-		},
-		style: function(element) {
-			return element.style.cssText.toLowerCase();
-		},
-		title: function(element) {
-			var node = element.getAttributeNode('title');
-			return node.specified ? node.nodeValue : null;
-		}
-	}
-};
+else if (Prototype.Browser.WebKit) {
+  Element.Methods.setOpacity = function(element, value) {
+    element = $(element);
+    element.style.opacity = (value == 1 || value === '') ? '' :
+      (value < 0.00001) ? 0 : value;
+
+    if (value == 1)
+      if(element.tagName == 'IMG' && element.width) {
+        element.width++; element.width--;
+      } else try {
+        var n = document.createTextNode(' ');
+        element.appendChild(n);
+        element.removeChild(n);
+      } catch (e) { }
+
+    return element;
+  };
+
+  // Safari returns margins on body which is incorrect if the child is absolutely
+  // positioned.  For performance reasons, redefine Element#cumulativeOffset for
+  // KHTML/WebKit only.
+  Element.Methods.cumulativeOffset = function(element) {
+    var valueT = 0, valueL = 0;
+    do {
+      valueT += element.offsetTop  || 0;
+      valueL += element.offsetLeft || 0;
+      if (element.offsetParent == document.body)
+        if (Element.getStyle(element, 'position') == 'absolute') break;
+
+      element = element.offsetParent;
+    } while (element);
+
+    return Element._returnOffset(valueL, valueT);
+  };
+}
 
-(function() {
-	Object.extend(this, {
-		href: this._getAttr,
-		src:  this._getAttr,
-		type: this._getAttr,
-		disabled: this._flag,
-		checked:  this._flag,
-		readonly: this._flag,
-		multiple: this._flag
-	});
-}).call(Element._attributeTranslations.values);
+if (Prototype.Browser.IE || Prototype.Browser.Opera) {
+  // IE and Opera are missing .innerHTML support for TABLE-related and SELECT elements
+  Element.Methods.update = function(element, content) {
+    element = $(element);
 
-Element.Methods.Simulated = {
-	hasAttribute: function(element, attribute) {
-		var t = Element._attributeTranslations, node;
-		attribute = t.names[attribute] || attribute;
-		node = $(element).getAttributeNode(attribute);
-		return node && node.specified;
-	}
-};
+    if (content && content.toElement) content = content.toElement();
+    if (Object.isElement(content)) return element.update().insert(content);
 
-Element.Methods.ByTag = {};
+    content = Object.toHTML(content);
+    var tagName = element.tagName.toUpperCase();
 
-Object.extend(Element, Element.Methods);
+    if (tagName in Element._insertionTranslations.tags) {
+      $A(element.childNodes).each(function(node) { element.removeChild(node) });
+      Element._getContentFromAnonymousElement(tagName, content.stripScripts())
+        .each(function(node) { element.appendChild(node) });
+    }
+    else element.innerHTML = content.stripScripts();
 
-if (!Prototype.BrowserFeatures.ElementExtensions &&
- document.createElement('div').__proto__) {
-	window.HTMLElement = {};
-	window.HTMLElement.prototype = document.createElement('div').__proto__;
-	Prototype.BrowserFeatures.ElementExtensions = true;
+    content.evalScripts.bind(content).defer();
+    return element;
+  };
 }
 
-Element.hasAttribute = function(element, attribute) {
-	if (element.hasAttribute) return element.hasAttribute(attribute);
-	return Element.Methods.Simulated.hasAttribute(element, attribute);
+if ('outerHTML' in document.createElement('div')) {
+  Element.Methods.replace = function(element, content) {
+    element = $(element);
+
+    if (content && content.toElement) content = content.toElement();
+    if (Object.isElement(content)) {
+      element.parentNode.replaceChild(content, element);
+      return element;
+    }
+
+    content = Object.toHTML(content);
+    var parent = element.parentNode, tagName = parent.tagName.toUpperCase();
+
+    if (Element._insertionTranslations.tags[tagName]) {
+      var nextSibling = element.next();
+      var fragments = Element._getContentFromAnonymousElement(tagName, content.stripScripts());
+      parent.removeChild(element);
+      if (nextSibling)
+        fragments.each(function(node) { parent.insertBefore(node, nextSibling) });
+      else
+        fragments.each(function(node) { parent.appendChild(node) });
+    }
+    else element.outerHTML = content.stripScripts();
+
+    content.evalScripts.bind(content).defer();
+    return element;
+  };
+}
+
+Element._returnOffset = function(l, t) {
+  var result = [l, t];
+  result.left = l;
+  result.top = t;
+  return result;
 };
 
-Element.addMethods = function(methods) {
-	var F = Prototype.BrowserFeatures, T = Element.Methods.ByTag;
-
-	if (!methods) {
-		Object.extend(Form, Form.Methods);
-		Object.extend(Form.Element, Form.Element.Methods);
-		Object.extend(Element.Methods.ByTag, {
-			"FORM":     Object.clone(Form.Methods),
-			"INPUT":    Object.clone(Form.Element.Methods),
-			"SELECT":   Object.clone(Form.Element.Methods),
-			"TEXTAREA": Object.clone(Form.Element.Methods)
-		});
-	}
-
-	if (arguments.length == 2) {
-		var tagName = methods;
-		methods = arguments[1];
-	}
-
-	if (!tagName) Object.extend(Element.Methods, methods || {});
-	else {
-		if (tagName.constructor == Array) tagName.each(extend);
-		else extend(tagName);
-	}
-
-	function extend(tagName) {
-		tagName = tagName.toUpperCase();
-		if (!Element.Methods.ByTag[tagName])
-			Element.Methods.ByTag[tagName] = {};
-		Object.extend(Element.Methods.ByTag[tagName], methods);
-	}
-
-	function copy(methods, destination, onlyIfAbsent) {
-		onlyIfAbsent = onlyIfAbsent || false;
-		var cache = Element.extend.cache;
-		for (var property in methods) {
-			var value = methods[property];
-			if (!onlyIfAbsent || !(property in destination))
-				destination[property] = cache.findOrStore(value);
-		}
-	}
-
-	function findDOMClass(tagName) {
-		var klass;
-		var trans = {
-			"OPTGROUP": "OptGroup", "TEXTAREA": "TextArea", "P": "Paragraph",
-			"FIELDSET": "FieldSet", "UL": "UList", "OL": "OList", "DL": "DList",
-			"DIR": "Directory", "H1": "Heading", "H2": "Heading", "H3": "Heading",
-			"H4": "Heading", "H5": "Heading", "H6": "Heading", "Q": "Quote",
-			"INS": "Mod", "DEL": "Mod", "A": "Anchor", "IMG": "Image", "CAPTION":
-			"TableCaption", "COL": "TableCol", "COLGROUP": "TableCol", "THEAD":
-			"TableSection", "TFOOT": "TableSection", "TBODY": "TableSection", "TR":
-			"TableRow", "TH": "TableCell", "TD": "TableCell", "FRAMESET":
-			"FrameSet", "IFRAME": "IFrame"
-		};
-		if (trans[tagName]) klass = 'HTML' + trans[tagName] + 'Element';
-		if (window[klass]) return window[klass];
-		klass = 'HTML' + tagName + 'Element';
-		if (window[klass]) return window[klass];
-		klass = 'HTML' + tagName.capitalize() + 'Element';
-		if (window[klass]) return window[klass];
-
-		window[klass] = {};
-		window[klass].prototype = document.createElement(tagName).__proto__;
-		return window[klass];
-	}
-
-	if (F.ElementExtensions) {
-		copy(Element.Methods, HTMLElement.prototype);
-		copy(Element.Methods.Simulated, HTMLElement.prototype, true);
-	}
-
-	if (F.SpecificElementExtensions) {
-		for (var tag in Element.Methods.ByTag) {
-			var klass = findDOMClass(tag);
-			if (typeof klass == "undefined") continue;
-			copy(T[tag], klass.prototype);
-		}
-	}
-
-	Object.extend(Element, Element.Methods);
-	delete Element.ByTag;
+Element._getContentFromAnonymousElement = function(tagName, html) {
+  var div = new Element('div'), t = Element._insertionTranslations.tags[tagName];
+  if (t) {
+    div.innerHTML = t[0] + html + t[1];
+    t[2].times(function() { div = div.firstChild });
+  } else div.innerHTML = html;
+  return $A(div.childNodes);
 };
 
-var Toggle = { display: Element.toggle };
+Element._insertionTranslations = {
+  before: function(element, node) {
+    element.parentNode.insertBefore(node, element);
+  },
+  top: function(element, node) {
+    element.insertBefore(node, element.firstChild);
+  },
+  bottom: function(element, node) {
+    element.appendChild(node);
+  },
+  after: function(element, node) {
+    element.parentNode.insertBefore(node, element.nextSibling);
+  },
+  tags: {
+    TABLE:  ['<table>',                '</table>',                   1],
+    TBODY:  ['<table><tbody>',         '</tbody></table>',           2],
+    TR:     ['<table><tbody><tr>',     '</tr></tbody></table>',      3],
+    TD:     ['<table><tbody><tr><td>', '</td></tr></tbody></table>', 4],
+    SELECT: ['<select>',               '</select>',                  1]
+  }
+};
 
-/*--------------------------------------------------------------------------*/
+(function() {
+  Object.extend(this.tags, {
+    THEAD: this.tags.TBODY,
+    TFOOT: this.tags.TBODY,
+    TH:    this.tags.TD
+  });
+}).call(Element._insertionTranslations);
 
-Abstract.Insertion = function(adjacency) {
-	this.adjacency = adjacency;
-}
+Element.Methods.Simulated = {
+  hasAttribute: function(element, attribute) {
+    attribute = Element._attributeTranslations.has[attribute] || attribute;
+    var node = $(element).getAttributeNode(attribute);
+    return node && node.specified;
+  }
+};
+
+Element.Methods.ByTag = { };
+
+Object.extend(Element, Element.Methods);
 
-Abstract.Insertion.prototype = {
-	initialize: function(element, content) {
-		this.element = $(element);
-		this.content = content.stripScripts();
-
-		if (this.adjacency && this.element.insertAdjacentHTML) {
-			try {
-				this.element.insertAdjacentHTML(this.adjacency, this.content);
-			} catch (e) {
-				var tagName = this.element.tagName.toUpperCase();
-				if (['TBODY', 'TR'].include(tagName)) {
-					this.insertContent(this.contentFromAnonymousTable());
-				} else {
-					throw e;
-				}
-			}
-		} else {
-			this.range = this.element.ownerDocument.createRange();
-			if (this.initializeRange) this.initializeRange();
-			this.insertContent([this.range.createContextualFragment(this.content)]);
-		}
-
-		setTimeout(function() {content.evalScripts()}, 10);
-	},
-
-	contentFromAnonymousTable: function() {
-		var div = document.createElement('div');
-		div.innerHTML = '<table><tbody>' + this.content + '</tbody></table>';
-		return $A(div.childNodes[0].childNodes[0].childNodes);
-	}
+if (!Prototype.BrowserFeatures.ElementExtensions &&
+    document.createElement('div').__proto__) {
+  window.HTMLElement = { };
+  window.HTMLElement.prototype = document.createElement('div').__proto__;
+  Prototype.BrowserFeatures.ElementExtensions = true;
 }
 
-var Insertion = new Object();
+Element.extend = (function() {
+  if (Prototype.BrowserFeatures.SpecificElementExtensions)
+    return Prototype.K;
 
-Insertion.Before = Class.create();
-Insertion.Before.prototype = Object.extend(new Abstract.Insertion('beforeBegin'), {
-	initializeRange: function() {
-		this.range.setStartBefore(this.element);
-	},
+  var Methods = { }, ByTag = Element.Methods.ByTag;
 
-	insertContent: function(fragments) {
-		fragments.each((function(fragment) {
-			this.element.parentNode.insertBefore(fragment, this.element);
-		}).bind(this));
-	}
-});
+  var extend = Object.extend(function(element) {
+    if (!element || element._extendedByPrototype ||
+        element.nodeType != 1 || element == window) return element;
 
-Insertion.Top = Class.create();
-Insertion.Top.prototype = Object.extend(new Abstract.Insertion('afterBegin'), {
-	initializeRange: function() {
-		this.range.selectNodeContents(this.element);
-		this.range.collapse(true);
-	},
-
-	insertContent: function(fragments) {
-		fragments.reverse(false).each((function(fragment) {
-			this.element.insertBefore(fragment, this.element.firstChild);
-		}).bind(this));
-	}
-});
+    var methods = Object.clone(Methods),
+      tagName = element.tagName, property, value;
 
-Insertion.Bottom = Class.create();
-Insertion.Bottom.prototype = Object.extend(new Abstract.Insertion('beforeEnd'), {
-	initializeRange: function() {
-		this.range.selectNodeContents(this.element);
-		this.range.collapse(this.element);
-	},
-
-	insertContent: function(fragments) {
-		fragments.each((function(fragment) {
-			this.element.appendChild(fragment);
-		}).bind(this));
-	}
-});
+    // extend methods for specific tags
+    if (ByTag[tagName]) Object.extend(methods, ByTag[tagName]);
 
-Insertion.After = Class.create();
-Insertion.After.prototype = Object.extend(new Abstract.Insertion('afterEnd'), {
-	initializeRange: function() {
-		this.range.setStartAfter(this.element);
-	},
-
-	insertContent: function(fragments) {
-		fragments.each((function(fragment) {
-			this.element.parentNode.insertBefore(fragment,
-				this.element.nextSibling);
-		}).bind(this));
-	}
-});
+    for (property in methods) {
+      value = methods[property];
+      if (Object.isFunction(value) && !(property in element))
+        element[property] = value.methodize();
+    }
 
-/*--------------------------------------------------------------------------*/
+    element._extendedByPrototype = Prototype.emptyFunction;
+    return element;
 
-Element.ClassNames = Class.create();
-Element.ClassNames.prototype = {
-	initialize: function(element) {
-		this.element = $(element);
-	},
-
-	_each: function(iterator) {
-		this.element.className.split(/\s+/).select(function(name) {
-			return name.length > 0;
-		})._each(iterator);
-	},
-
-	set: function(className) {
-		this.element.className = className;
-	},
-
-	add: function(classNameToAdd) {
-		if (this.include(classNameToAdd)) return;
-		this.set($A(this).concat(classNameToAdd).join(' '));
-	},
-
-	remove: function(classNameToRemove) {
-		if (!this.include(classNameToRemove)) return;
-		this.set($A(this).without(classNameToRemove).join(' '));
-	},
-
-	toString: function() {
-		return $A(this).join(' ');
-	}
+  }, {
+    refresh: function() {
+      // extend methods for all tags (Safari doesn't need this)
+      if (!Prototype.BrowserFeatures.ElementExtensions) {
+        Object.extend(Methods, Element.Methods);
+        Object.extend(Methods, Element.Methods.Simulated);
+      }
+    }
+  });
+
+  extend.refresh();
+  return extend;
+})();
+
+Element.hasAttribute = function(element, attribute) {
+  if (element.hasAttribute) return element.hasAttribute(attribute);
+  return Element.Methods.Simulated.hasAttribute(element, attribute);
 };
 
-Object.extend(Element.ClassNames.prototype, Enumerable);
+Element.addMethods = function(methods) {
+  var F = Prototype.BrowserFeatures, T = Element.Methods.ByTag;
+
+  if (!methods) {
+    Object.extend(Form, Form.Methods);
+    Object.extend(Form.Element, Form.Element.Methods);
+    Object.extend(Element.Methods.ByTag, {
+      "FORM":     Object.clone(Form.Methods),
+      "INPUT":    Object.clone(Form.Element.Methods),
+      "SELECT":   Object.clone(Form.Element.Methods),
+      "TEXTAREA": Object.clone(Form.Element.Methods)
+    });
+  }
+
+  if (arguments.length == 2) {
+    var tagName = methods;
+    methods = arguments[1];
+  }
+
+  if (!tagName) Object.extend(Element.Methods, methods || { });
+  else {
+    if (Object.isArray(tagName)) tagName.each(extend);
+    else extend(tagName);
+  }
+
+  function extend(tagName) {
+    tagName = tagName.toUpperCase();
+    if (!Element.Methods.ByTag[tagName])
+      Element.Methods.ByTag[tagName] = { };
+    Object.extend(Element.Methods.ByTag[tagName], methods);
+  }
+
+  function copy(methods, destination, onlyIfAbsent) {
+    onlyIfAbsent = onlyIfAbsent || false;
+    for (var property in methods) {
+      var value = methods[property];
+      if (!Object.isFunction(value)) continue;
+      if (!onlyIfAbsent || !(property in destination))
+        destination[property] = value.methodize();
+    }
+  }
+
+  function findDOMClass(tagName) {
+    var klass;
+    var trans = {
+      "OPTGROUP": "OptGroup", "TEXTAREA": "TextArea", "P": "Paragraph",
+      "FIELDSET": "FieldSet", "UL": "UList", "OL": "OList", "DL": "DList",
+      "DIR": "Directory", "H1": "Heading", "H2": "Heading", "H3": "Heading",
+      "H4": "Heading", "H5": "Heading", "H6": "Heading", "Q": "Quote",
+      "INS": "Mod", "DEL": "Mod", "A": "Anchor", "IMG": "Image", "CAPTION":
+      "TableCaption", "COL": "TableCol", "COLGROUP": "TableCol", "THEAD":
+      "TableSection", "TFOOT": "TableSection", "TBODY": "TableSection", "TR":
+      "TableRow", "TH": "TableCell", "TD": "TableCell", "FRAMESET":
+      "FrameSet", "IFRAME": "IFrame"
+    };
+    if (trans[tagName]) klass = 'HTML' + trans[tagName] + 'Element';
+    if (window[klass]) return window[klass];
+    klass = 'HTML' + tagName + 'Element';
+    if (window[klass]) return window[klass];
+    klass = 'HTML' + tagName.capitalize() + 'Element';
+    if (window[klass]) return window[klass];
+
+    window[klass] = { };
+    window[klass].prototype = document.createElement(tagName).__proto__;
+    return window[klass];
+  }
+
+  if (F.ElementExtensions) {
+    copy(Element.Methods, HTMLElement.prototype);
+    copy(Element.Methods.Simulated, HTMLElement.prototype, true);
+  }
+
+  if (F.SpecificElementExtensions) {
+    for (var tag in Element.Methods.ByTag) {
+      var klass = findDOMClass(tag);
+      if (Object.isUndefined(klass)) continue;
+      copy(T[tag], klass.prototype);
+    }
+  }
+
+  Object.extend(Element, Element.Methods);
+  delete Element.ByTag;
+
+  if (Element.extend.refresh) Element.extend.refresh();
+  Element.cache = { };
+};
+
+document.viewport = {
+  getDimensions: function() {
+    var dimensions = { };
+    var B = Prototype.Browser;
+    $w('width height').each(function(d) {
+      var D = d.capitalize();
+      dimensions[d] = (B.WebKit && !document.evaluate) ? self['inner' + D] :
+        (B.Opera) ? document.body['client' + D] : document.documentElement['client' + D];
+    });
+    return dimensions;
+  },
+
+  getWidth: function() {
+    return this.getDimensions().width;
+  },
+
+  getHeight: function() {
+    return this.getDimensions().height;
+  },
+
+  getScrollOffsets: function() {
+    return Element._returnOffset(
+      window.pageXOffset || document.documentElement.scrollLeft || document.body.scrollLeft,
+      window.pageYOffset || document.documentElement.scrollTop || document.body.scrollTop);
+  }
+};
 /* Portions of the Selector class are derived from Jack Slocum’s DomQuery,
  * part of YUI-Ext version 0.40, distributed under the terms of an MIT-style
  * license.  Please see http://www.yui-ext.com/ for more information. */
 
-var Selector = Class.create();
-
-Selector.prototype = {
-	initialize: function(expression) {
-		this.expression = expression.strip();
-		this.compileMatcher();
-	},
-
-	compileMatcher: function() {
-		// Selectors with namespaced attributes can't use the XPath version
-		if (Prototype.BrowserFeatures.XPath && !(/\[[\w-]*?:/).test(this.expression))
-			return this.compileXPathMatcher();
-
-		var e = this.expression, ps = Selector.patterns, h = Selector.handlers,
-				c = Selector.criteria, le, p, m;
-
-		if (Selector._cache[e]) {
-			this.matcher = Selector._cache[e]; return;
-		}
-		this.matcher = ["this.matcher = function(root) {",
-										"var r = root, h = Selector.handlers, c = false, n;"];
-
-		while (e && le != e && (/\S/).test(e)) {
-			le = e;
-			for (var i in ps) {
-				p = ps[i];
-				if (m = e.match(p)) {
-					this.matcher.push(typeof c[i] == 'function' ? c[i](m) :
-						new Template(c[i]).evaluate(m));
-					e = e.replace(m[0], '');
-					break;
-				}
-			}
-		}
-
-		this.matcher.push("return h.unique(n);\n}");
-		eval(this.matcher.join('\n'));
-		Selector._cache[this.expression] = this.matcher;
-	},
-
-	compileXPathMatcher: function() {
-		var e = this.expression, ps = Selector.patterns,
-				x = Selector.xpath, le,  m;
-
-		if (Selector._cache[e]) {
-			this.xpath = Selector._cache[e]; return;
-		}
-
-		this.matcher = ['.//*'];
-		while (e && le != e && (/\S/).test(e)) {
-			le = e;
-			for (var i in ps) {
-				if (m = e.match(ps[i])) {
-					this.matcher.push(typeof x[i] == 'function' ? x[i](m) :
-						new Template(x[i]).evaluate(m));
-					e = e.replace(m[0], '');
-					break;
-				}
-			}
-		}
-
-		this.xpath = this.matcher.join('');
-		Selector._cache[this.expression] = this.xpath;
-	},
-
-	findElements: function(root) {
-		root = root || document;
-		if (this.xpath) return document._getElementsByXPath(this.xpath, root);
-		return this.matcher(root);
-	},
-
-	match: function(element) {
-		return this.findElements(document).include(element);
-	},
-
-	toString: function() {
-		return this.expression;
-	},
-
-	inspect: function() {
-		return "#<Selector:" + this.expression.inspect() + ">";
-	}
-};
+var Selector = Class.create({
+  initialize: function(expression) {
+    this.expression = expression.strip();
+    this.compileMatcher();
+  },
+
+  shouldUseXPath: function() {
+    if (!Prototype.BrowserFeatures.XPath) return false;
+
+    var e = this.expression;
+
+    // Safari 3 chokes on :*-of-type and :empty
+    if (Prototype.Browser.WebKit &&
+     (e.include("-of-type") || e.include(":empty")))
+      return false;
+
+    // XPath can't do namespaced attributes, nor can it read
+    // the "checked" property from DOM nodes
+    if ((/(\[[\w-]*?:|:checked)/).test(this.expression))
+      return false;
+
+    return true;
+  },
+
+  compileMatcher: function() {
+    if (this.shouldUseXPath())
+      return this.compileXPathMatcher();
+
+    var e = this.expression, ps = Selector.patterns, h = Selector.handlers,
+        c = Selector.criteria, le, p, m;
+
+    if (Selector._cache[e]) {
+      this.matcher = Selector._cache[e];
+      return;
+    }
+
+    this.matcher = ["this.matcher = function(root) {",
+                    "var r = root, h = Selector.handlers, c = false, n;"];
+
+    while (e && le != e && (/\S/).test(e)) {
+      le = e;
+      for (var i in ps) {
+        p = ps[i];
+        if (m = e.match(p)) {
+          this.matcher.push(Object.isFunction(c[i]) ? c[i](m) :
+    	      new Template(c[i]).evaluate(m));
+          e = e.replace(m[0], '');
+          break;
+        }
+      }
+    }
+
+    this.matcher.push("return h.unique(n);\n}");
+    eval(this.matcher.join('\n'));
+    Selector._cache[this.expression] = this.matcher;
+  },
+
+  compileXPathMatcher: function() {
+    var e = this.expression, ps = Selector.patterns,
+        x = Selector.xpath, le, m;
+
+    if (Selector._cache[e]) {
+      this.xpath = Selector._cache[e]; return;
+    }
+
+    this.matcher = ['.//*'];
+    while (e && le != e && (/\S/).test(e)) {
+      le = e;
+      for (var i in ps) {
+        if (m = e.match(ps[i])) {
+          this.matcher.push(Object.isFunction(x[i]) ? x[i](m) :
+            new Template(x[i]).evaluate(m));
+          e = e.replace(m[0], '');
+          break;
+        }
+      }
+    }
+
+    this.xpath = this.matcher.join('');
+    Selector._cache[this.expression] = this.xpath;
+  },
+
+  findElements: function(root) {
+    root = root || document;
+    if (this.xpath) return document._getElementsByXPath(this.xpath, root);
+    return this.matcher(root);
+  },
+
+  match: function(element) {
+    this.tokens = [];
+
+    var e = this.expression, ps = Selector.patterns, as = Selector.assertions;
+    var le, p, m;
+
+    while (e && le !== e && (/\S/).test(e)) {
+      le = e;
+      for (var i in ps) {
+        p = ps[i];
+        if (m = e.match(p)) {
+          // use the Selector.assertions methods unless the selector
+          // is too complex.
+          if (as[i]) {
+            this.tokens.push([i, Object.clone(m)]);
+            e = e.replace(m[0], '');
+          } else {
+            // reluctantly do a document-wide search
+            // and look for a match in the array
+            return this.findElements(document).include(element);
+          }
+        }
+      }
+    }
+
+    var match = true, name, matches;
+    for (var i = 0, token; token = this.tokens[i]; i++) {
+      name = token[0], matches = token[1];
+      if (!Selector.assertions[name](element, matches)) {
+        match = false; break;
+      }
+    }
+
+    return match;
+  },
+
+  toString: function() {
+    return this.expression;
+  },
+
+  inspect: function() {
+    return "#<Selector:" + this.expression.inspect() + ">";
+  }
+});
 
 Object.extend(Selector, {
-	_cache: {},
-
-	xpath: {
-		descendant:   "//*",
-		child:        "/*",
-		adjacent:     "/following-sibling::*[1]",
-		laterSibling: '/following-sibling::*',
-		tagName:      function(m) {
-			if (m[1] == '*') return '';
-			return "[local-name()='" + m[1].toLowerCase() +
-						 "' or local-name()='" + m[1].toUpperCase() + "']";
-		},
-		className:    "[contains(concat(' ', @class, ' '), ' #{1} ')]",
-		id:           "[@id='#{1}']",
-		attrPresence: "[@#{1}]",
-		attr: function(m) {
-			m[3] = m[5] || m[6];
-			return new Template(Selector.xpath.operators[m[2]]).evaluate(m);
-		},
-		pseudo: function(m) {
-			var h = Selector.xpath.pseudos[m[1]];
-			if (!h) return '';
-			if (typeof h === 'function') return h(m);
-			return new Template(Selector.xpath.pseudos[m[1]]).evaluate(m);
-		},
-		operators: {
-			'=':  "[@#{1}='#{3}']",
-			'!=': "[@#{1}!='#{3}']",
-			'^=': "[starts-with(@#{1}, '#{3}')]",
-			'$=': "[substring(@#{1}, (string-length(@#{1}) - string-length('#{3}') + 1))='#{3}']",
-			'*=': "[contains(@#{1}, '#{3}')]",
-			'~=': "[contains(concat(' ', @#{1}, ' '), ' #{3} ')]",
-			'|=': "[contains(concat('-', @#{1}, '-'), '-#{3}-')]"
-		},
-		pseudos: {
-			'first-child': '[not(preceding-sibling::*)]',
-			'last-child':  '[not(following-sibling::*)]',
-			'only-child':  '[not(preceding-sibling::* or following-sibling::*)]',
-			'empty':       "[count(*) = 0 and (count(text()) = 0 or translate(text(), ' \t\r\n', '') = '')]",
-			'checked':     "[@checked]",
-			'disabled':    "[@disabled]",
-			'enabled':     "[not(@disabled)]",
-			'not': function(m) {
-				var e = m[6], p = Selector.patterns,
-						x = Selector.xpath, le, m, v;
-
-				var exclusion = [];
-				while (e && le != e && (/\S/).test(e)) {
-					le = e;
-					for (var i in p) {
-						if (m = e.match(p[i])) {
-							v = typeof x[i] == 'function' ? x[i](m) : new Template(x[i]).evaluate(m);
-							exclusion.push("(" + v.substring(1, v.length - 1) + ")");
-							e = e.replace(m[0], '');
-							break;
-						}
-					}
-				}
-				return "[not(" + exclusion.join(" and ") + ")]";
-			},
-			'nth-child':      function(m) {
-				return Selector.xpath.pseudos.nth("(count(./preceding-sibling::*) + 1) ", m);
-			},
-			'nth-last-child': function(m) {
-				return Selector.xpath.pseudos.nth("(count(./following-sibling::*) + 1) ", m);
-			},
-			'nth-of-type':    function(m) {
-				return Selector.xpath.pseudos.nth("position() ", m);
-			},
-			'nth-last-of-type': function(m) {
-				return Selector.xpath.pseudos.nth("(last() + 1 - position()) ", m);
-			},
-			'first-of-type':  function(m) {
-				m[6] = "1"; return Selector.xpath.pseudos['nth-of-type'](m);
-			},
-			'last-of-type':   function(m) {
-				m[6] = "1"; return Selector.xpath.pseudos['nth-last-of-type'](m);
-			},
-			'only-of-type':   function(m) {
-				var p = Selector.xpath.pseudos; return p['first-of-type'](m) + p['last-of-type'](m);
-			},
-			nth: function(fragment, m) {
-				var mm, formula = m[6], predicate;
-				if (formula == 'even') formula = '2n+0';
-				if (formula == 'odd')  formula = '2n+1';
-				if (mm = formula.match(/^(\d+)$/)) // digit only
-					return '[' + fragment + "= " + mm[1] + ']';
-				if (mm = formula.match(/^(-?\d*)?n(([+-])(\d+))?/)) { // an+b
-					if (mm[1] == "-") mm[1] = -1;
-					var a = mm[1] ? Number(mm[1]) : 1;
-					var b = mm[2] ? Number(mm[2]) : 0;
-					predicate = "[((#{fragment} - #{b}) mod #{a} = 0) and " +
-					"((#{fragment} - #{b}) div #{a} >= 0)]";
-					return new Template(predicate).evaluate({
-						fragment: fragment, a: a, b: b });
-				}
-			}
-		}
-	},
-
-	criteria: {
-		tagName:      'n = h.tagName(n, r, "#{1}", c);   c = false;',
-		className:    'n = h.className(n, r, "#{1}", c); c = false;',
-		id:           'n = h.id(n, r, "#{1}", c);        c = false;',
-		attrPresence: 'n = h.attrPresence(n, r, "#{1}"); c = false;',
-		attr: function(m) {
-			m[3] = (m[5] || m[6]);
-			return new Template('n = h.attr(n, r, "#{1}", "#{3}", "#{2}"); c = false;').evaluate(m);
-		},
-		pseudo:       function(m) {
-			if (m[6]) m[6] = m[6].replace(/"/g, '\\"');
-			return new Template('n = h.pseudo(n, "#{1}", "#{6}", r, c); c = false;').evaluate(m);
-		},
-		descendant:   'c = "descendant";',
-		child:        'c = "child";',
-		adjacent:     'c = "adjacent";',
-		laterSibling: 'c = "laterSibling";'
-	},
-
-	patterns: {
-		// combinators must be listed first
-		// (and descendant needs to be last combinator)
-		laterSibling: /^\s*~\s*/,
-		child:        /^\s*>\s*/,
-		adjacent:     /^\s*\+\s*/,
-		descendant:   /^\s/,
-
-		// selectors follow
-		tagName:      /^\s*(\*|[\w\-]+)(\b|$)?/,
-		id:           /^#([\w\-\*]+)(\b|$)/,
-		className:    /^\.([\w\-\*]+)(\b|$)/,
-		pseudo:       /^:((first|last|nth|nth-last|only)(-child|-of-type)|empty|checked|(en|dis)abled|not)(\((.*?)\))?(\b|$|\s|(?=:))/,
-		attrPresence: /^\[([\w]+)\]/,
-		attr:         /\[((?:[\w-]*:)?[\w-]+)\s*(?:([!^$*~|]?=)\s*((['"])([^\]]*?)\4|([^'"][^\]]*?)))?\]/
-	},
-
-	handlers: {
-		// UTILITY FUNCTIONS
-		// joins two collections
-		concat: function(a, b) {
-			for (var i = 0, node; node = b[i]; i++)
-				a.push(node);
-			return a;
-		},
-
-		// marks an array of nodes for counting
-		mark: function(nodes) {
-			for (var i = 0, node; node = nodes[i]; i++)
-				node._counted = true;
-			return nodes;
-		},
-
-		unmark: function(nodes) {
-			for (var i = 0, node; node = nodes[i]; i++)
-				node._counted = undefined;
-			return nodes;
-		},
-
-		// mark each child node with its position (for nth calls)
-		// "ofType" flag indicates whether we're indexing for nth-of-type
-		// rather than nth-child
-		index: function(parentNode, reverse, ofType) {
-			parentNode._counted = true;
-			if (reverse) {
-				for (var nodes = parentNode.childNodes, i = nodes.length - 1, j = 1; i >= 0; i--) {
-					node = nodes[i];
-					if (node.nodeType == 1 && (!ofType || node._counted)) node.nodeIndex = j++;
-				}
-			} else {
-				for (var i = 0, j = 1, nodes = parentNode.childNodes; node = nodes[i]; i++)
-					if (node.nodeType == 1 && (!ofType || node._counted)) node.nodeIndex = j++;
-			}
-		},
-
-		// filters out duplicates and extends all nodes
-		unique: function(nodes) {
-			if (nodes.length == 0) return nodes;
-			var results = [], n;
-			for (var i = 0, l = nodes.length; i < l; i++)
-				if (!(n = nodes[i])._counted) {
-					n._counted = true;
-					results.push(Element.extend(n));
-				}
-			return Selector.handlers.unmark(results);
-		},
-
-		// COMBINATOR FUNCTIONS
-		descendant: function(nodes) {
-			var h = Selector.handlers;
-			for (var i = 0, results = [], node; node = nodes[i]; i++)
-				h.concat(results, node.getElementsByTagName('*'));
-			return results;
-		},
-
-		child: function(nodes) {
-			var h = Selector.handlers;
-			for (var i = 0, results = [], node; node = nodes[i]; i++) {
-				for (var j = 0, children = [], child; child = node.childNodes[j]; j++)
-					if (child.nodeType == 1 && child.tagName != '!') results.push(child);
-			}
-			return results;
-		},
-
-		adjacent: function(nodes) {
-			for (var i = 0, results = [], node; node = nodes[i]; i++) {
-				var next = this.nextElementSibling(node);
-				if (next) results.push(next);
-			}
-			return results;
-		},
-
-		laterSibling: function(nodes) {
-			var h = Selector.handlers;
-			for (var i = 0, results = [], node; node = nodes[i]; i++)
-				h.concat(results, Element.nextSiblings(node));
-			return results;
-		},
-
-		nextElementSibling: function(node) {
-			while (node = node.nextSibling)
-				if (node.nodeType == 1) return node;
-			return null;
-		},
-
-		previousElementSibling: function(node) {
-			while (node = node.previousSibling)
-				if (node.nodeType == 1) return node;
-			return null;
-		},
-
-		// TOKEN FUNCTIONS
-		tagName: function(nodes, root, tagName, combinator) {
-			tagName = tagName.toUpperCase();
-			var results = [], h = Selector.handlers;
-			if (nodes) {
-				if (combinator) {
-					// fastlane for ordinary descendant combinators
-					if (combinator == "descendant") {
-						for (var i = 0, node; node = nodes[i]; i++)
-							h.concat(results, node.getElementsByTagName(tagName));
-						return results;
-					} else nodes = this[combinator](nodes);
-					if (tagName == "*") return nodes;
-				}
-				for (var i = 0, node; node = nodes[i]; i++)
-					if (node.tagName.toUpperCase() == tagName) results.push(node);
-				return results;
-			} else return root.getElementsByTagName(tagName);
-		},
-
-		id: function(nodes, root, id, combinator) {
-			var targetNode = $(id), h = Selector.handlers;
-			if (!nodes && root == document) return targetNode ? [targetNode] : [];
-			if (nodes) {
-				if (combinator) {
-					if (combinator == 'child') {
-						for (var i = 0, node; node = nodes[i]; i++)
-							if (targetNode.parentNode == node) return [targetNode];
-					} else if (combinator == 'descendant') {
-						for (var i = 0, node; node = nodes[i]; i++)
-							if (Element.descendantOf(targetNode, node)) return [targetNode];
-					} else if (combinator == 'adjacent') {
-						for (var i = 0, node; node = nodes[i]; i++)
-							if (Selector.handlers.previousElementSibling(targetNode) == node)
-								return [targetNode];
-					} else nodes = h[combinator](nodes);
-				}
-				for (var i = 0, node; node = nodes[i]; i++)
-					if (node == targetNode) return [targetNode];
-				return [];
-			}
-			return (targetNode && Element.descendantOf(targetNode, root)) ? [targetNode] : [];
-		},
-
-		className: function(nodes, root, className, combinator) {
-			if (nodes && combinator) nodes = this[combinator](nodes);
-			return Selector.handlers.byClassName(nodes, root, className);
-		},
-
-		byClassName: function(nodes, root, className) {
-			if (!nodes) nodes = Selector.handlers.descendant([root]);
-			var needle = ' ' + className + ' ';
-			for (var i = 0, results = [], node, nodeClassName; node = nodes[i]; i++) {
-				nodeClassName = node.className;
-				if (nodeClassName.length == 0) continue;
-				if (nodeClassName == className || (' ' + nodeClassName + ' ').include(needle))
-					results.push(node);
-			}
-			return results;
-		},
-
-		attrPresence: function(nodes, root, attr) {
-			var results = [];
-			for (var i = 0, node; node = nodes[i]; i++)
-				if (Element.hasAttribute(node, attr)) results.push(node);
-			return results;
-		},
-
-		attr: function(nodes, root, attr, value, operator) {
-			if (!nodes) nodes = root.getElementsByTagName("*");
-			var handler = Selector.operators[operator], results = [];
-			for (var i = 0, node; node = nodes[i]; i++) {
-				var nodeValue = Element.readAttribute(node, attr);
-				if (nodeValue === null) continue;
-				if (handler(nodeValue, value)) results.push(node);
-			}
-			return results;
-		},
-
-		pseudo: function(nodes, name, value, root, combinator) {
-			if (nodes && combinator) nodes = this[combinator](nodes);
-			if (!nodes) nodes = root.getElementsByTagName("*");
-			return Selector.pseudos[name](nodes, value, root);
-		}
-	},
-
-	pseudos: {
-		'first-child': function(nodes, value, root) {
-			for (var i = 0, results = [], node; node = nodes[i]; i++) {
-				if (Selector.handlers.previousElementSibling(node)) continue;
-					results.push(node);
-			}
-			return results;
-		},
-		'last-child': function(nodes, value, root) {
-			for (var i = 0, results = [], node; node = nodes[i]; i++) {
-				if (Selector.handlers.nextElementSibling(node)) continue;
-					results.push(node);
-			}
-			return results;
-		},
-		'only-child': function(nodes, value, root) {
-			var h = Selector.handlers;
-			for (var i = 0, results = [], node; node = nodes[i]; i++)
-				if (!h.previousElementSibling(node) && !h.nextElementSibling(node))
-					results.push(node);
-			return results;
-		},
-		'nth-child':        function(nodes, formula, root) {
-			return Selector.pseudos.nth(nodes, formula, root);
-		},
-		'nth-last-child':   function(nodes, formula, root) {
-			return Selector.pseudos.nth(nodes, formula, root, true);
-		},
-		'nth-of-type':      function(nodes, formula, root) {
-			return Selector.pseudos.nth(nodes, formula, root, false, true);
-		},
-		'nth-last-of-type': function(nodes, formula, root) {
-			return Selector.pseudos.nth(nodes, formula, root, true, true);
-		},
-		'first-of-type':    function(nodes, formula, root) {
-			return Selector.pseudos.nth(nodes, "1", root, false, true);
-		},
-		'last-of-type':     function(nodes, formula, root) {
-			return Selector.pseudos.nth(nodes, "1", root, true, true);
-		},
-		'only-of-type':     function(nodes, formula, root) {
-			var p = Selector.pseudos;
-			return p['last-of-type'](p['first-of-type'](nodes, formula, root), formula, root);
-		},
-
-		// handles the an+b logic
-		getIndices: function(a, b, total) {
-			if (a == 0) return b > 0 ? [b] : [];
-			return $R(1, total).inject([], function(memo, i) {
-				if (0 == (i - b) % a && (i - b) / a >= 0) memo.push(i);
-				return memo;
-			});
-		},
-
-		// handles nth(-last)-child, nth(-last)-of-type, and (first|last)-of-type
-		nth: function(nodes, formula, root, reverse, ofType) {
-			if (nodes.length == 0) return [];
-			if (formula == 'even') formula = '2n+0';
-			if (formula == 'odd')  formula = '2n+1';
-			var h = Selector.handlers, results = [], indexed = [], m;
-			h.mark(nodes);
-			for (var i = 0, node; node = nodes[i]; i++) {
-				if (!node.parentNode._counted) {
-					h.index(node.parentNode, reverse, ofType);
-					indexed.push(node.parentNode);
-				}
-			}
-			if (formula.match(/^\d+$/)) { // just a number
-				formula = Number(formula);
-				for (var i = 0, node; node = nodes[i]; i++)
-					if (node.nodeIndex == formula) results.push(node);
-			} else if (m = formula.match(/^(-?\d*)?n(([+-])(\d+))?/)) { // an+b
-				if (m[1] == "-") m[1] = -1;
-				var a = m[1] ? Number(m[1]) : 1;
-				var b = m[2] ? Number(m[2]) : 0;
-				var indices = Selector.pseudos.getIndices(a, b, nodes.length);
-				for (var i = 0, node, l = indices.length; node = nodes[i]; i++) {
-					for (var j = 0; j < l; j++)
-						if (node.nodeIndex == indices[j]) results.push(node);
-				}
-			}
-			h.unmark(nodes);
-			h.unmark(indexed);
-			return results;
-		},
-
-		'empty': function(nodes, value, root) {
-			for (var i = 0, results = [], node; node = nodes[i]; i++) {
-				// IE treats comments as element nodes
-				if (node.tagName == '!' || (node.firstChild && !node.innerHTML.match(/^\s*$/))) continue;
-				results.push(node);
-			}
-			return results;
-		},
-
-		'not': function(nodes, selector, root) {
-			var h = Selector.handlers, selectorType, m;
-			var exclusions = new Selector(selector).findElements(root);
-			h.mark(exclusions);
-			for (var i = 0, results = [], node; node = nodes[i]; i++)
-				if (!node._counted) results.push(node);
-			h.unmark(exclusions);
-			return results;
-		},
-
-		'enabled': function(nodes, value, root) {
-			for (var i = 0, results = [], node; node = nodes[i]; i++)
-				if (!node.disabled) results.push(node);
-			return results;
-		},
-
-		'disabled': function(nodes, value, root) {
-			for (var i = 0, results = [], node; node = nodes[i]; i++)
-				if (node.disabled) results.push(node);
-			return results;
-		},
-
-		'checked': function(nodes, value, root) {
-			for (var i = 0, results = [], node; node = nodes[i]; i++)
-				if (node.checked) results.push(node);
-			return results;
-		}
-	},
-
-	operators: {
-		'=':  function(nv, v) { return nv == v; },
-		'!=': function(nv, v) { return nv != v; },
-		'^=': function(nv, v) { return nv.startsWith(v); },
-		'$=': function(nv, v) { return nv.endsWith(v); },
-		'*=': function(nv, v) { return nv.include(v); },
-		'~=': function(nv, v) { return (' ' + nv + ' ').include(' ' + v + ' '); },
-		'|=': function(nv, v) { return ('-' + nv.toUpperCase() + '-').include('-' + v.toUpperCase() + '-'); }
-	},
-
-	matchElements: function(elements, expression) {
-		var matches = new Selector(expression).findElements(), h = Selector.handlers;
-		h.mark(matches);
-		for (var i = 0, results = [], element; element = elements[i]; i++)
-			if (element._counted) results.push(element);
-		h.unmark(matches);
-		return results;
-	},
-
-	findElement: function(elements, expression, index) {
-		if (typeof expression == 'number') {
-			index = expression; expression = false;
-		}
-		return Selector.matchElements(elements, expression || '*')[index || 0];
-	},
-
-	findChildElements: function(element, expressions) {
-		var exprs = expressions.join(','), expressions = [];
-		exprs.scan(/(([\w#:.~>+()\s-]+|\*|\[.*?\])+)\s*(,|$)/, function(m) {
-			expressions.push(m[1].strip());
-		});
-		var results = [], h = Selector.handlers;
-		for (var i = 0, l = expressions.length, selector; i < l; i++) {
-			selector = new Selector(expressions[i].strip());
-			h.concat(results, selector.findElements(element));
-		}
-		return (l > 1) ? h.unique(results) : results;
-	}
+  _cache: { },
+
+  xpath: {
+    descendant:   "//*",
+    child:        "/*",
+    adjacent:     "/following-sibling::*[1]",
+    laterSibling: '/following-sibling::*',
+    tagName:      function(m) {
+      if (m[1] == '*') return '';
+      return "[local-name()='" + m[1].toLowerCase() +
+             "' or local-name()='" + m[1].toUpperCase() + "']";
+    },
+    className:    "[contains(concat(' ', @class, ' '), ' #{1} ')]",
+    id:           "[@id='#{1}']",
+    attrPresence: function(m) {
+      m[1] = m[1].toLowerCase();
+      return new Template("[@#{1}]").evaluate(m);
+    },
+    attr: function(m) {
+      m[1] = m[1].toLowerCase();
+      m[3] = m[5] || m[6];
+      return new Template(Selector.xpath.operators[m[2]]).evaluate(m);
+    },
+    pseudo: function(m) {
+      var h = Selector.xpath.pseudos[m[1]];
+      if (!h) return '';
+      if (Object.isFunction(h)) return h(m);
+      return new Template(Selector.xpath.pseudos[m[1]]).evaluate(m);
+    },
+    operators: {
+      '=':  "[@#{1}='#{3}']",
+      '!=': "[@#{1}!='#{3}']",
+      '^=': "[starts-with(@#{1}, '#{3}')]",
+      '$=': "[substring(@#{1}, (string-length(@#{1}) - string-length('#{3}') + 1))='#{3}']",
+      '*=': "[contains(@#{1}, '#{3}')]",
+      '~=': "[contains(concat(' ', @#{1}, ' '), ' #{3} ')]",
+      '|=': "[contains(concat('-', @#{1}, '-'), '-#{3}-')]"
+    },
+    pseudos: {
+      'first-child': '[not(preceding-sibling::*)]',
+      'last-child':  '[not(following-sibling::*)]',
+      'only-child':  '[not(preceding-sibling::* or following-sibling::*)]',
+      'empty':       "[count(*) = 0 and (count(text()) = 0 or translate(text(), ' \t\r\n', '') = '')]",
+      'checked':     "[@checked]",
+      'disabled':    "[@disabled]",
+      'enabled':     "[not(@disabled)]",
+      'not': function(m) {
+        var e = m[6], p = Selector.patterns,
+            x = Selector.xpath, le, v;
+
+        var exclusion = [];
+        while (e && le != e && (/\S/).test(e)) {
+          le = e;
+          for (var i in p) {
+            if (m = e.match(p[i])) {
+              v = Object.isFunction(x[i]) ? x[i](m) : new Template(x[i]).evaluate(m);
+              exclusion.push("(" + v.substring(1, v.length - 1) + ")");
+              e = e.replace(m[0], '');
+              break;
+            }
+          }
+        }
+        return "[not(" + exclusion.join(" and ") + ")]";
+      },
+      'nth-child':      function(m) {
+        return Selector.xpath.pseudos.nth("(count(./preceding-sibling::*) + 1) ", m);
+      },
+      'nth-last-child': function(m) {
+        return Selector.xpath.pseudos.nth("(count(./following-sibling::*) + 1) ", m);
+      },
+      'nth-of-type':    function(m) {
+        return Selector.xpath.pseudos.nth("position() ", m);
+      },
+      'nth-last-of-type': function(m) {
+        return Selector.xpath.pseudos.nth("(last() + 1 - position()) ", m);
+      },
+      'first-of-type':  function(m) {
+        m[6] = "1"; return Selector.xpath.pseudos['nth-of-type'](m);
+      },
+      'last-of-type':   function(m) {
+        m[6] = "1"; return Selector.xpath.pseudos['nth-last-of-type'](m);
+      },
+      'only-of-type':   function(m) {
+        var p = Selector.xpath.pseudos; return p['first-of-type'](m) + p['last-of-type'](m);
+      },
+      nth: function(fragment, m) {
+        var mm, formula = m[6], predicate;
+        if (formula == 'even') formula = '2n+0';
+        if (formula == 'odd')  formula = '2n+1';
+        if (mm = formula.match(/^(\d+)$/)) // digit only
+          return '[' + fragment + "= " + mm[1] + ']';
+        if (mm = formula.match(/^(-?\d*)?n(([+-])(\d+))?/)) { // an+b
+          if (mm[1] == "-") mm[1] = -1;
+          var a = mm[1] ? Number(mm[1]) : 1;
+          var b = mm[2] ? Number(mm[2]) : 0;
+          predicate = "[((#{fragment} - #{b}) mod #{a} = 0) and " +
+          "((#{fragment} - #{b}) div #{a} >= 0)]";
+          return new Template(predicate).evaluate({
+            fragment: fragment, a: a, b: b });
+        }
+      }
+    }
+  },
+
+  criteria: {
+    tagName:      'n = h.tagName(n, r, "#{1}", c);      c = false;',
+    className:    'n = h.className(n, r, "#{1}", c);    c = false;',
+    id:           'n = h.id(n, r, "#{1}", c);           c = false;',
+    attrPresence: 'n = h.attrPresence(n, r, "#{1}", c); c = false;',
+    attr: function(m) {
+      m[3] = (m[5] || m[6]);
+      return new Template('n = h.attr(n, r, "#{1}", "#{3}", "#{2}", c); c = false;').evaluate(m);
+    },
+    pseudo: function(m) {
+      if (m[6]) m[6] = m[6].replace(/"/g, '\\"');
+      return new Template('n = h.pseudo(n, "#{1}", "#{6}", r, c); c = false;').evaluate(m);
+    },
+    descendant:   'c = "descendant";',
+    child:        'c = "child";',
+    adjacent:     'c = "adjacent";',
+    laterSibling: 'c = "laterSibling";'
+  },
+
+  patterns: {
+    // combinators must be listed first
+    // (and descendant needs to be last combinator)
+    laterSibling: /^\s*~\s*/,
+    child:        /^\s*>\s*/,
+    adjacent:     /^\s*\+\s*/,
+    descendant:   /^\s/,
+
+    // selectors follow
+    tagName:      /^\s*(\*|[\w\-]+)(\b|$)?/,
+    id:           /^#([\w\-\*]+)(\b|$)/,
+    className:    /^\.([\w\-\*]+)(\b|$)/,
+    pseudo:
+/^:((first|last|nth|nth-last|only)(-child|-of-type)|empty|checked|(en|dis)abled|not)(\((.*?)\))?(\b|$|(?=\s|[:+~>]))/,
+    attrPresence: /^\[([\w]+)\]/,
+    attr:         /\[((?:[\w-]*:)?[\w-]+)\s*(?:([!^$*~|]?=)\s*((['"])([^\4]*?)\4|([^'"][^\]]*?)))?\]/
+  },
+
+  // for Selector.match and Element#match
+  assertions: {
+    tagName: function(element, matches) {
+      return matches[1].toUpperCase() == element.tagName.toUpperCase();
+    },
+
+    className: function(element, matches) {
+      return Element.hasClassName(element, matches[1]);
+    },
+
+    id: function(element, matches) {
+      return element.id === matches[1];
+    },
+
+    attrPresence: function(element, matches) {
+      return Element.hasAttribute(element, matches[1]);
+    },
+
+    attr: function(element, matches) {
+      var nodeValue = Element.readAttribute(element, matches[1]);
+      return nodeValue && Selector.operators[matches[2]](nodeValue, matches[5] || matches[6]);
+    }
+  },
+
+  handlers: {
+    // UTILITY FUNCTIONS
+    // joins two collections
+    concat: function(a, b) {
+      for (var i = 0, node; node = b[i]; i++)
+        a.push(node);
+      return a;
+    },
+
+    // marks an array of nodes for counting
+    mark: function(nodes) {
+      var _true = Prototype.emptyFunction;
+      for (var i = 0, node; node = nodes[i]; i++)
+        node._countedByPrototype = _true;
+      return nodes;
+    },
+
+    unmark: function(nodes) {
+      for (var i = 0, node; node = nodes[i]; i++)
+        node._countedByPrototype = undefined;
+      return nodes;
+    },
+
+    // mark each child node with its position (for nth calls)
+    // "ofType" flag indicates whether we're indexing for nth-of-type
+    // rather than nth-child
+    index: function(parentNode, reverse, ofType) {
+      parentNode._countedByPrototype = Prototype.emptyFunction;
+      if (reverse) {
+        for (var nodes = parentNode.childNodes, i = nodes.length - 1, j = 1; i >= 0; i--) {
+          var node = nodes[i];
+          if (node.nodeType == 1 && (!ofType || node._countedByPrototype)) node.nodeIndex = j++;
+        }
+      } else {
+        for (var i = 0, j = 1, nodes = parentNode.childNodes; node = nodes[i]; i++)
+          if (node.nodeType == 1 && (!ofType || node._countedByPrototype)) node.nodeIndex = j++;
+      }
+    },
+
+    // filters out duplicates and extends all nodes
+    unique: function(nodes) {
+      if (nodes.length == 0) return nodes;
+      var results = [], n;
+      for (var i = 0, l = nodes.length; i < l; i++)
+        if (!(n = nodes[i])._countedByPrototype) {
+          n._countedByPrototype = Prototype.emptyFunction;
+          results.push(Element.extend(n));
+        }
+      return Selector.handlers.unmark(results);
+    },
+
+    // COMBINATOR FUNCTIONS
+    descendant: function(nodes) {
+      var h = Selector.handlers;
+      for (var i = 0, results = [], node; node = nodes[i]; i++)
+        h.concat(results, node.getElementsByTagName('*'));
+      return results;
+    },
+
+    child: function(nodes) {
+      var h = Selector.handlers;
+      for (var i = 0, results = [], node; node = nodes[i]; i++) {
+        for (var j = 0, child; child = node.childNodes[j]; j++)
+          if (child.nodeType == 1 && child.tagName != '!') results.push(child);
+      }
+      return results;
+    },
+
+    adjacent: function(nodes) {
+      for (var i = 0, results = [], node; node = nodes[i]; i++) {
+        var next = this.nextElementSibling(node);
+        if (next) results.push(next);
+      }
+      return results;
+    },
+
+    laterSibling: function(nodes) {
+      var h = Selector.handlers;
+      for (var i = 0, results = [], node; node = nodes[i]; i++)
+        h.concat(results, Element.nextSiblings(node));
+      return results;
+    },
+
+    nextElementSibling: function(node) {
+      while (node = node.nextSibling)
+	      if (node.nodeType == 1) return node;
+      return null;
+    },
+
+    previousElementSibling: function(node) {
+      while (node = node.previousSibling)
+        if (node.nodeType == 1) return node;
+      return null;
+    },
+
+    // TOKEN FUNCTIONS
+    tagName: function(nodes, root, tagName, combinator) {
+      var uTagName = tagName.toUpperCase();
+      var results = [], h = Selector.handlers;
+      if (nodes) {
+        if (combinator) {
+          // fastlane for ordinary descendant combinators
+          if (combinator == "descendant") {
+            for (var i = 0, node; node = nodes[i]; i++)
+              h.concat(results, node.getElementsByTagName(tagName));
+            return results;
+          } else nodes = this[combinator](nodes);
+          if (tagName == "*") return nodes;
+        }
+        for (var i = 0, node; node = nodes[i]; i++)
+          if (node.tagName.toUpperCase() === uTagName) results.push(node);
+        return results;
+      } else return root.getElementsByTagName(tagName);
+    },
+
+    id: function(nodes, root, id, combinator) {
+      var targetNode = $(id), h = Selector.handlers;
+      if (!targetNode) return [];
+      if (!nodes && root == document) return [targetNode];
+      if (nodes) {
+        if (combinator) {
+          if (combinator == 'child') {
+            for (var i = 0, node; node = nodes[i]; i++)
+              if (targetNode.parentNode == node) return [targetNode];
+          } else if (combinator == 'descendant') {
+            for (var i = 0, node; node = nodes[i]; i++)
+              if (Element.descendantOf(targetNode, node)) return [targetNode];
+          } else if (combinator == 'adjacent') {
+            for (var i = 0, node; node = nodes[i]; i++)
+              if (Selector.handlers.previousElementSibling(targetNode) == node)
+                return [targetNode];
+          } else nodes = h[combinator](nodes);
+        }
+        for (var i = 0, node; node = nodes[i]; i++)
+          if (node == targetNode) return [targetNode];
+        return [];
+      }
+      return (targetNode && Element.descendantOf(targetNode, root)) ? [targetNode] : [];
+    },
+
+    className: function(nodes, root, className, combinator) {
+      if (nodes && combinator) nodes = this[combinator](nodes);
+      return Selector.handlers.byClassName(nodes, root, className);
+    },
+
+    byClassName: function(nodes, root, className) {
+      if (!nodes) nodes = Selector.handlers.descendant([root]);
+      var needle = ' ' + className + ' ';
+      for (var i = 0, results = [], node, nodeClassName; node = nodes[i]; i++) {
+        nodeClassName = node.className;
+        if (nodeClassName.length == 0) continue;
+        if (nodeClassName == className || (' ' + nodeClassName + ' ').include(needle))
+          results.push(node);
+      }
+      return results;
+    },
+
+    attrPresence: function(nodes, root, attr, combinator) {
+      if (!nodes) nodes = root.getElementsByTagName("*");
+      if (nodes && combinator) nodes = this[combinator](nodes);
+      var results = [];
+      for (var i = 0, node; node = nodes[i]; i++)
+        if (Element.hasAttribute(node, attr)) results.push(node);
+      return results;
+    },
+
+    attr: function(nodes, root, attr, value, operator, combinator) {
+      if (!nodes) nodes = root.getElementsByTagName("*");
+      if (nodes && combinator) nodes = this[combinator](nodes);
+      var handler = Selector.operators[operator], results = [];
+      for (var i = 0, node; node = nodes[i]; i++) {
+        var nodeValue = Element.readAttribute(node, attr);
+        if (nodeValue === null) continue;
+        if (handler(nodeValue, value)) results.push(node);
+      }
+      return results;
+    },
+
+    pseudo: function(nodes, name, value, root, combinator) {
+      if (nodes && combinator) nodes = this[combinator](nodes);
+      if (!nodes) nodes = root.getElementsByTagName("*");
+      return Selector.pseudos[name](nodes, value, root);
+    }
+  },
+
+  pseudos: {
+    'first-child': function(nodes, value, root) {
+      for (var i = 0, results = [], node; node = nodes[i]; i++) {
+        if (Selector.handlers.previousElementSibling(node)) continue;
+          results.push(node);
+      }
+      return results;
+    },
+    'last-child': function(nodes, value, root) {
+      for (var i = 0, results = [], node; node = nodes[i]; i++) {
+        if (Selector.handlers.nextElementSibling(node)) continue;
+          results.push(node);
+      }
+      return results;
+    },
+    'only-child': function(nodes, value, root) {
+      var h = Selector.handlers;
+      for (var i = 0, results = [], node; node = nodes[i]; i++)
+        if (!h.previousElementSibling(node) && !h.nextElementSibling(node))
+          results.push(node);
+      return results;
+    },
+    'nth-child':        function(nodes, formula, root) {
+      return Selector.pseudos.nth(nodes, formula, root);
+    },
+    'nth-last-child':   function(nodes, formula, root) {
+      return Selector.pseudos.nth(nodes, formula, root, true);
+    },
+    'nth-of-type':      function(nodes, formula, root) {
+      return Selector.pseudos.nth(nodes, formula, root, false, true);
+    },
+    'nth-last-of-type': function(nodes, formula, root) {
+      return Selector.pseudos.nth(nodes, formula, root, true, true);
+    },
+    'first-of-type':    function(nodes, formula, root) {
+      return Selector.pseudos.nth(nodes, "1", root, false, true);
+    },
+    'last-of-type':     function(nodes, formula, root) {
+      return Selector.pseudos.nth(nodes, "1", root, true, true);
+    },
+    'only-of-type':     function(nodes, formula, root) {
+      var p = Selector.pseudos;
+      return p['last-of-type'](p['first-of-type'](nodes, formula, root), formula, root);
+    },
+
+    // handles the an+b logic
+    getIndices: function(a, b, total) {
+      if (a == 0) return b > 0 ? [b] : [];
+      return $R(1, total).inject([], function(memo, i) {
+        if (0 == (i - b) % a && (i - b) / a >= 0) memo.push(i);
+        return memo;
+      });
+    },
+
+    // handles nth(-last)-child, nth(-last)-of-type, and (first|last)-of-type
+    nth: function(nodes, formula, root, reverse, ofType) {
+      if (nodes.length == 0) return [];
+      if (formula == 'even') formula = '2n+0';
+      if (formula == 'odd')  formula = '2n+1';
+      var h = Selector.handlers, results = [], indexed = [], m;
+      h.mark(nodes);
+      for (var i = 0, node; node = nodes[i]; i++) {
+        if (!node.parentNode._countedByPrototype) {
+          h.index(node.parentNode, reverse, ofType);
+          indexed.push(node.parentNode);
+        }
+      }
+      if (formula.match(/^\d+$/)) { // just a number
+        formula = Number(formula);
+        for (var i = 0, node; node = nodes[i]; i++)
+          if (node.nodeIndex == formula) results.push(node);
+      } else if (m = formula.match(/^(-?\d*)?n(([+-])(\d+))?/)) { // an+b
+        if (m[1] == "-") m[1] = -1;
+        var a = m[1] ? Number(m[1]) : 1;
+        var b = m[2] ? Number(m[2]) : 0;
+        var indices = Selector.pseudos.getIndices(a, b, nodes.length);
+        for (var i = 0, node, l = indices.length; node = nodes[i]; i++) {
+          for (var j = 0; j < l; j++)
+            if (node.nodeIndex == indices[j]) results.push(node);
+        }
+      }
+      h.unmark(nodes);
+      h.unmark(indexed);
+      return results;
+    },
+
+    'empty': function(nodes, value, root) {
+      for (var i = 0, results = [], node; node = nodes[i]; i++) {
+        // IE treats comments as element nodes
+        if (node.tagName == '!' || (node.firstChild && !node.innerHTML.match(/^\s*$/))) continue;
+        results.push(node);
+      }
+      return results;
+    },
+
+    'not': function(nodes, selector, root) {
+      var h = Selector.handlers, selectorType, m;
+      var exclusions = new Selector(selector).findElements(root);
+      h.mark(exclusions);
+      for (var i = 0, results = [], node; node = nodes[i]; i++)
+        if (!node._countedByPrototype) results.push(node);
+      h.unmark(exclusions);
+      return results;
+    },
+
+    'enabled': function(nodes, value, root) {
+      for (var i = 0, results = [], node; node = nodes[i]; i++)
+        if (!node.disabled) results.push(node);
+      return results;
+    },
+
+    'disabled': function(nodes, value, root) {
+      for (var i = 0, results = [], node; node = nodes[i]; i++)
+        if (node.disabled) results.push(node);
+      return results;
+    },
+
+    'checked': function(nodes, value, root) {
+      for (var i = 0, results = [], node; node = nodes[i]; i++)
+        if (node.checked) results.push(node);
+      return results;
+    }
+  },
+
+  operators: {
+    '=':  function(nv, v) { return nv == v; },
+    '!=': function(nv, v) { return nv != v; },
+    '^=': function(nv, v) { return nv.startsWith(v); },
+    '$=': function(nv, v) { return nv.endsWith(v); },
+    '*=': function(nv, v) { return nv.include(v); },
+    '~=': function(nv, v) { return (' ' + nv + ' ').include(' ' + v + ' '); },
+    '|=': function(nv, v) { return ('-' + nv.toUpperCase() + '-').include('-' + v.toUpperCase() + '-'); }
+  },
+
+  split: function(expression) {
+    var expressions = [];
+    expression.scan(/(([\w#:.~>+()\s-]+|\*|\[.*?\])+)\s*(,|$)/, function(m) {
+      expressions.push(m[1].strip());
+    });
+    return expressions;
+  },
+
+  matchElements: function(elements, expression) {
+    var matches = $$(expression), h = Selector.handlers;
+    h.mark(matches);
+    for (var i = 0, results = [], element; element = elements[i]; i++)
+      if (element._countedByPrototype) results.push(element);
+    h.unmark(matches);
+    return results;
+  },
+
+  findElement: function(elements, expression, index) {
+    if (Object.isNumber(expression)) {
+      index = expression; expression = false;
+    }
+    return Selector.matchElements(elements, expression || '*')[index || 0];
+  },
+
+  findChildElements: function(element, expressions) {
+    expressions = Selector.split(expressions.join(','));
+    var results = [], h = Selector.handlers;
+    for (var i = 0, l = expressions.length, selector; i < l; i++) {
+      selector = new Selector(expressions[i].strip());
+      h.concat(results, selector.findElements(element));
+    }
+    return (l > 1) ? h.unique(results) : results;
+  }
 });
 
+if (Prototype.Browser.IE) {
+  Object.extend(Selector.handlers, {
+    // IE returns comment nodes on getElementsByTagName("*").
+    // Filter them out.
+    concat: function(a, b) {
+      for (var i = 0, node; node = b[i]; i++)
+        if (node.tagName !== "!") a.push(node);
+      return a;
+    },
+
+    // IE improperly serializes _countedByPrototype in (inner|outer)HTML.
+    unmark: function(nodes) {
+      for (var i = 0, node; node = nodes[i]; i++)
+        node.removeAttribute('_countedByPrototype');
+      return nodes;
+    }
+  });
+}
+
 function $$() {
-	return Selector.findChildElements(document, $A(arguments));
+  return Selector.findChildElements(document, $A(arguments));
 }
 var Form = {
-	reset: function(form) {
-		$(form).reset();
-		return form;
-	},
-
-	serializeElements: function(elements, getHash) {
-		var data = elements.inject({}, function(result, element) {
-			if (!element.disabled && element.name) {
-				var key = element.name, value = $(element).getValue();
-				if (value != null) {
-					if (key in result) {
-						if (result[key].constructor != Array) result[key] = [result[key]];
-						result[key].push(value);
-					}
-					else result[key] = value;
-				}
-			}
-			return result;
-		});
-
-		return getHash ? data : Hash.toQueryString(data);
-	}
+  reset: function(form) {
+    $(form).reset();
+    return form;
+  },
+
+  serializeElements: function(elements, options) {
+    if (typeof options != 'object') options = { hash: !!options };
+    else if (Object.isUndefined(options.hash)) options.hash = true;
+    var key, value, submitted = false, submit = options.submit;
+
+    var data = elements.inject({ }, function(result, element) {
+      if (!element.disabled && element.name) {
+        key = element.name; value = $(element).getValue();
+        if (value != null && (element.type != 'submit' || (!submitted &&
+            submit !== false && (!submit || key == submit) && (submitted = true)))) {
+          if (key in result) {
+            // a key is already present; construct an array of values
+            if (!Object.isArray(result[key])) result[key] = [result[key]];
+            result[key].push(value);
+          }
+          else result[key] = value;
+        }
+      }
+      return result;
+    });
+
+    return options.hash ? data : Object.toQueryString(data);
+  }
 };
 
 Form.Methods = {
-	serialize: function(form, getHash) {
-		return Form.serializeElements(Form.getElements(form), getHash);
-	},
-
-	getElements: function(form) {
-		return $A($(form).getElementsByTagName('*')).inject([],
-			function(elements, child) {
-				if (Form.Element.Serializers[child.tagName.toLowerCase()])
-					elements.push(Element.extend(child));
-				return elements;
-			}
-		);
-	},
-
-	getInputs: function(form, typeName, name) {
-		form = $(form);
-		var inputs = form.getElementsByTagName('input');
-
-		if (!typeName && !name) return $A(inputs).map(Element.extend);
-
-		for (var i = 0, matchingInputs = [], length = inputs.length; i < length; i++) {
-			var input = inputs[i];
-			if ((typeName && input.type != typeName) || (name && input.name != name))
-				continue;
-			matchingInputs.push(Element.extend(input));
-		}
-
-		return matchingInputs;
-	},
-
-	disable: function(form) {
-		form = $(form);
-		Form.getElements(form).invoke('disable');
-		return form;
-	},
-
-	enable: function(form) {
-		form = $(form);
-		Form.getElements(form).invoke('enable');
-		return form;
-	},
-
-	findFirstElement: function(form) {
-		return $(form).getElements().find(function(element) {
-			return element.type != 'hidden' && !element.disabled &&
-				['input', 'select', 'textarea'].include(element.tagName.toLowerCase());
-		});
-	},
-
-	focusFirstElement: function(form) {
-		form = $(form);
-		form.findFirstElement().activate();
-		return form;
-	},
-
-	request: function(form, options) {
-		form = $(form), options = Object.clone(options || {});
-
-		var params = options.parameters;
-		options.parameters = form.serialize(true);
-
-		if (params) {
-			if (typeof params == 'string') params = params.toQueryParams();
-			Object.extend(options.parameters, params);
-		}
-
-		if (form.hasAttribute('method') && !options.method)
-			options.method = form.method;
-
-		return new Ajax.Request(form.readAttribute('action'), options);
-	}
-}
+  serialize: function(form, options) {
+    return Form.serializeElements(Form.getElements(form), options);
+  },
+
+  getElements: function(form) {
+    return $A($(form).getElementsByTagName('*')).inject([],
+      function(elements, child) {
+        if (Form.Element.Serializers[child.tagName.toLowerCase()])
+          elements.push(Element.extend(child));
+        return elements;
+      }
+    );
+  },
+
+  getInputs: function(form, typeName, name) {
+    form = $(form);
+    var inputs = form.getElementsByTagName('input');
+
+    if (!typeName && !name) return $A(inputs).map(Element.extend);
+
+    for (var i = 0, matchingInputs = [], length = inputs.length; i < length; i++) {
+      var input = inputs[i];
+      if ((typeName && input.type != typeName) || (name && input.name != name))
+        continue;
+      matchingInputs.push(Element.extend(input));
+    }
+
+    return matchingInputs;
+  },
+
+  disable: function(form) {
+    form = $(form);
+    Form.getElements(form).invoke('disable');
+    return form;
+  },
+
+  enable: function(form) {
+    form = $(form);
+    Form.getElements(form).invoke('enable');
+    return form;
+  },
+
+  findFirstElement: function(form) {
+    var elements = $(form).getElements().findAll(function(element) {
+      return 'hidden' != element.type && !element.disabled;
+    });
+    var firstByIndex = elements.findAll(function(element) {
+      return element.hasAttribute('tabIndex') && element.tabIndex >= 0;
+    }).sortBy(function(element) { return element.tabIndex }).first();
+
+    return firstByIndex ? firstByIndex : elements.find(function(element) {
+      return ['input', 'select', 'textarea'].include(element.tagName.toLowerCase());
+    });
+  },
+
+  focusFirstElement: function(form) {
+    form = $(form);
+    form.findFirstElement().activate();
+    return form;
+  },
+
+  request: function(form, options) {
+    form = $(form), options = Object.clone(options || { });
+
+    var params = options.parameters, action = form.readAttribute('action') || '';
+    if (action.blank()) action = window.location.href;
+    options.parameters = form.serialize(true);
+
+    if (params) {
+      if (Object.isString(params)) params = params.toQueryParams();
+      Object.extend(options.parameters, params);
+    }
+
+    if (form.hasAttribute('method') && !options.method)
+      options.method = form.method;
+
+    return new Ajax.Request(action, options);
+  }
+};
 
 /*--------------------------------------------------------------------------*/
 
 Form.Element = {
-	focus: function(element) {
-		$(element).focus();
-		return element;
-	},
-
-	select: function(element) {
-		$(element).select();
-		return element;
-	}
-}
+  focus: function(element) {
+    $(element).focus();
+    return element;
+  },
+
+  select: function(element) {
+    $(element).select();
+    return element;
+  }
+};
 
 Form.Element.Methods = {
-	serialize: function(element) {
-		element = $(element);
-		if (!element.disabled && element.name) {
-			var value = element.getValue();
-			if (value != undefined) {
-				var pair = {};
-				pair[element.name] = value;
-				return Hash.toQueryString(pair);
-			}
-		}
-		return '';
-	},
-
-	getValue: function(element) {
-		element = $(element);
-		var method = element.tagName.toLowerCase();
-		return Form.Element.Serializers[method](element);
-	},
-
-	clear: function(element) {
-		$(element).value = '';
-		return element;
-	},
-
-	present: function(element) {
-		return $(element).value != '';
-	},
-
-	activate: function(element) {
-		element = $(element);
-		try {
-			element.focus();
-			if (element.select && (element.tagName.toLowerCase() != 'input' ||
-				!['button', 'reset', 'submit'].include(element.type)))
-				element.select();
-		} catch (e) {}
-		return element;
-	},
-
-	disable: function(element) {
-		element = $(element);
-		element.blur();
-		element.disabled = true;
-		return element;
-	},
-
-	enable: function(element) {
-		element = $(element);
-		element.disabled = false;
-		return element;
-	}
-}
+  serialize: function(element) {
+    element = $(element);
+    if (!element.disabled && element.name) {
+      var value = element.getValue();
+      if (value != undefined) {
+        var pair = { };
+        pair[element.name] = value;
+        return Object.toQueryString(pair);
+      }
+    }
+    return '';
+  },
+
+  getValue: function(element) {
+    element = $(element);
+    var method = element.tagName.toLowerCase();
+    return Form.Element.Serializers[method](element);
+  },
+
+  setValue: function(element, value) {
+    element = $(element);
+    var method = element.tagName.toLowerCase();
+    Form.Element.Serializers[method](element, value);
+    return element;
+  },
+
+  clear: function(element) {
+    $(element).value = '';
+    return element;
+  },
+
+  present: function(element) {
+    return $(element).value != '';
+  },
+
+  activate: function(element) {
+    element = $(element);
+    try {
+      element.focus();
+      if (element.select && (element.tagName.toLowerCase() != 'input' ||
+          !['button', 'reset', 'submit'].include(element.type)))
+        element.select();
+    } catch (e) { }
+    return element;
+  },
+
+  disable: function(element) {
+    element = $(element);
+    element.blur();
+    element.disabled = true;
+    return element;
+  },
+
+  enable: function(element) {
+    element = $(element);
+    element.disabled = false;
+    return element;
+  }
+};
 
 /*--------------------------------------------------------------------------*/
 
@@ -2796,482 +3567,655 @@ var $F = Form.Element.Methods.getValue;
 /*--------------------------------------------------------------------------*/
 
 Form.Element.Serializers = {
-	input: function(element) {
-		switch (element.type.toLowerCase()) {
-			case 'checkbox':
-			case 'radio':
-				return Form.Element.Serializers.inputSelector(element);
-			default:
-				return Form.Element.Serializers.textarea(element);
-		}
-	},
-
-	inputSelector: function(element) {
-		return element.checked ? element.value : null;
-	},
-
-	textarea: function(element) {
-		return element.value;
-	},
-
-	select: function(element) {
-		return this[element.type == 'select-one' ?
-			'selectOne' : 'selectMany'](element);
-	},
-
-	selectOne: function(element) {
-		var index = element.selectedIndex;
-		return index >= 0 ? this.optionValue(element.options[index]) : null;
-	},
-
-	selectMany: function(element) {
-		var values, length = element.length;
-		if (!length) return null;
-
-		for (var i = 0, values = []; i < length; i++) {
-			var opt = element.options[i];
-			if (opt.selected) values.push(this.optionValue(opt));
-		}
-		return values;
-	},
-
-	optionValue: function(opt) {
-		// extend element because hasAttribute may not be native
-		return Element.extend(opt).hasAttribute('value') ? opt.value : opt.text;
-	}
-}
+  input: function(element, value) {
+    switch (element.type.toLowerCase()) {
+      case 'checkbox':
+      case 'radio':
+        return Form.Element.Serializers.inputSelector(element, value);
+      default:
+        return Form.Element.Serializers.textarea(element, value);
+    }
+  },
+
+  inputSelector: function(element, value) {
+    if (Object.isUndefined(value)) return element.checked ? element.value : null;
+    else element.checked = !!value;
+  },
+
+  textarea: function(element, value) {
+    if (Object.isUndefined(value)) return element.value;
+    else element.value = value;
+  },
+
+  select: function(element, index) {
+    if (Object.isUndefined(index))
+      return this[element.type == 'select-one' ?
+        'selectOne' : 'selectMany'](element);
+    else {
+      var opt, value, single = !Object.isArray(index);
+      for (var i = 0, length = element.length; i < length; i++) {
+        opt = element.options[i];
+        value = this.optionValue(opt);
+        if (single) {
+          if (value == index) {
+            opt.selected = true;
+            return;
+          }
+        }
+        else opt.selected = index.include(value);
+      }
+    }
+  },
+
+  selectOne: function(element) {
+    var index = element.selectedIndex;
+    return index >= 0 ? this.optionValue(element.options[index]) : null;
+  },
+
+  selectMany: function(element) {
+    var values, length = element.length;
+    if (!length) return null;
+
+    for (var i = 0, values = []; i < length; i++) {
+      var opt = element.options[i];
+      if (opt.selected) values.push(this.optionValue(opt));
+    }
+    return values;
+  },
+
+  optionValue: function(opt) {
+    // extend element because hasAttribute may not be native
+    return Element.extend(opt).hasAttribute('value') ? opt.value : opt.text;
+  }
+};
 
 /*--------------------------------------------------------------------------*/
 
-Abstract.TimedObserver = function() {}
-Abstract.TimedObserver.prototype = {
-	initialize: function(element, frequency, callback) {
-		this.frequency = frequency;
-		this.element   = $(element);
-		this.callback  = callback;
-
-		this.lastValue = this.getValue();
-		this.registerCallback();
-	},
-
-	registerCallback: function() {
-		setInterval(this.onTimerEvent.bind(this), this.frequency * 1000);
-	},
-
-	onTimerEvent: function() {
-		var value = this.getValue();
-		var changed = ('string' == typeof this.lastValue && 'string' == typeof value
-			? this.lastValue != value : String(this.lastValue) != String(value));
-		if (changed) {
-			this.callback(this.element, value);
-			this.lastValue = value;
-		}
-	}
-}
+Abstract.TimedObserver = Class.create(PeriodicalExecuter, {
+  initialize: function($super, element, frequency, callback) {
+    $super(callback, frequency);
+    this.element   = $(element);
+    this.lastValue = this.getValue();
+  },
+
+  execute: function() {
+    var value = this.getValue();
+    if (Object.isString(this.lastValue) && Object.isString(value) ?
+        this.lastValue != value : String(this.lastValue) != String(value)) {
+      this.callback(this.element, value);
+      this.lastValue = value;
+    }
+  }
+});
 
-Form.Element.Observer = Class.create();
-Form.Element.Observer.prototype = Object.extend(new Abstract.TimedObserver(), {
-	getValue: function() {
-		return Form.Element.getValue(this.element);
-	}
+Form.Element.Observer = Class.create(Abstract.TimedObserver, {
+  getValue: function() {
+    return Form.Element.getValue(this.element);
+  }
 });
 
-Form.Observer = Class.create();
-Form.Observer.prototype = Object.extend(new Abstract.TimedObserver(), {
-	getValue: function() {
-		return Form.serialize(this.element);
-	}
+Form.Observer = Class.create(Abstract.TimedObserver, {
+  getValue: function() {
+    return Form.serialize(this.element);
+  }
 });
 
 /*--------------------------------------------------------------------------*/
 
-Abstract.EventObserver = function() {}
-Abstract.EventObserver.prototype = {
-	initialize: function(element, callback) {
-		this.element  = $(element);
-		this.callback = callback;
-
-		this.lastValue = this.getValue();
-		if (this.element.tagName.toLowerCase() == 'form')
-			this.registerFormCallbacks();
-		else
-			this.registerCallback(this.element);
-	},
-
-	onElementEvent: function() {
-		var value = this.getValue();
-		if (this.lastValue != value) {
-			this.callback(this.element, value);
-			this.lastValue = value;
-		}
-	},
-
-	registerFormCallbacks: function() {
-		Form.getElements(this.element).each(this.registerCallback.bind(this));
-	},
-
-	registerCallback: function(element) {
-		if (element.type) {
-			switch (element.type.toLowerCase()) {
-				case 'checkbox':
-				case 'radio':
-					Event.observe(element, 'click', this.onElementEvent.bind(this));
-					break;
-				default:
-					Event.observe(element, 'change', this.onElementEvent.bind(this));
-					break;
-			}
-		}
-	}
-}
+Abstract.EventObserver = Class.create({
+  initialize: function(element, callback) {
+    this.element  = $(element);
+    this.callback = callback;
+
+    this.lastValue = this.getValue();
+    if (this.element.tagName.toLowerCase() == 'form')
+      this.registerFormCallbacks();
+    else
+      this.registerCallback(this.element);
+  },
+
+  onElementEvent: function() {
+    var value = this.getValue();
+    if (this.lastValue != value) {
+      this.callback(this.element, value);
+      this.lastValue = value;
+    }
+  },
+
+  registerFormCallbacks: function() {
+    Form.getElements(this.element).each(this.registerCallback, this);
+  },
+
+  registerCallback: function(element) {
+    if (element.type) {
+      switch (element.type.toLowerCase()) {
+        case 'checkbox':
+        case 'radio':
+          Event.observe(element, 'click', this.onElementEvent.bind(this));
+          break;
+        default:
+          Event.observe(element, 'change', this.onElementEvent.bind(this));
+          break;
+      }
+    }
+  }
+});
 
-Form.Element.EventObserver = Class.create();
-Form.Element.EventObserver.prototype = Object.extend(new Abstract.EventObserver(), {
-	getValue: function() {
-		return Form.Element.getValue(this.element);
-	}
+Form.Element.EventObserver = Class.create(Abstract.EventObserver, {
+  getValue: function() {
+    return Form.Element.getValue(this.element);
+  }
 });
 
-Form.EventObserver = Class.create();
-Form.EventObserver.prototype = Object.extend(new Abstract.EventObserver(), {
-	getValue: function() {
-		return Form.serialize(this.element);
-	}
+Form.EventObserver = Class.create(Abstract.EventObserver, {
+  getValue: function() {
+    return Form.serialize(this.element);
+  }
 });
-if (!window.Event) {
-	var Event = new Object();
-}
+if (!window.Event) var Event = { };
 
 Object.extend(Event, {
-	KEY_BACKSPACE: 8,
-	KEY_TAB:       9,
-	KEY_RETURN:   13,
-	KEY_ESC:      27,
-	KEY_LEFT:     37,
-	KEY_UP:       38,
-	KEY_RIGHT:    39,
-	KEY_DOWN:     40,
-	KEY_DELETE:   46,
-	KEY_HOME:     36,
-	KEY_END:      35,
-	KEY_PAGEUP:   33,
-	KEY_PAGEDOWN: 34,
-
-	element: function(event) {
-		return $(event.target || event.srcElement);
-	},
-
-	isLeftClick: function(event) {
-		return (((event.which) && (event.which == 1)) ||
-						((event.button) && (event.button == 1)));
-	},
-
-	pointerX: function(event) {
-		return event.pageX || (event.clientX +
-			(document.documentElement.scrollLeft || document.body.scrollLeft));
-	},
-
-	pointerY: function(event) {
-		return event.pageY || (event.clientY +
-			(document.documentElement.scrollTop || document.body.scrollTop));
-	},
-
-	stop: function(event) {
-		if (event.preventDefault) {
-			event.preventDefault();
-			event.stopPropagation();
-		} else {
-			event.returnValue = false;
-			event.cancelBubble = true;
-		}
-	},
-
-	// find the first node with the given tagName, starting from the
-	// node the event was triggered on; traverses the DOM upwards
-	findElement: function(event, tagName) {
-		var element = Event.element(event);
-		while (element.parentNode && (!element.tagName ||
-				(element.tagName.toUpperCase() != tagName.toUpperCase())))
-			element = element.parentNode;
-		return element;
-	},
-
-	observers: false,
-
-	_observeAndCache: function(element, name, observer, useCapture) {
-		if (!this.observers) this.observers = [];
-		if (element.addEventListener) {
-			this.observers.push([element, name, observer, useCapture]);
-			element.addEventListener(name, observer, useCapture);
-		} else if (element.attachEvent) {
-			this.observers.push([element, name, observer, useCapture]);
-			element.attachEvent('on' + name, observer);
-		}
-	},
-
-	unloadCache: function() {
-		if (!Event.observers) return;
-		for (var i = 0, length = Event.observers.length; i < length; i++) {
-			Event.stopObserving.apply(this, Event.observers[i]);
-			Event.observers[i][0] = null;
-		}
-		Event.observers = false;
-	},
-
-	observe: function(element, name, observer, useCapture) {
-		element = $(element);
-		useCapture = useCapture || false;
-
-		if (name == 'keypress' &&
-			(Prototype.Browser.WebKit || element.attachEvent))
-			name = 'keydown';
-
-		Event._observeAndCache(element, name, observer, useCapture);
-	},
-
-	stopObserving: function(element, name, observer, useCapture) {
-		element = $(element);
-		useCapture = useCapture || false;
-
-		if (name == 'keypress' &&
-				(Prototype.Browser.WebKit || element.attachEvent))
-			name = 'keydown';
-
-		if (element.removeEventListener) {
-			element.removeEventListener(name, observer, useCapture);
-		} else if (element.detachEvent) {
-			try {
-				element.detachEvent('on' + name, observer);
-			} catch (e) {}
-		}
-	}
+  KEY_BACKSPACE: 8,
+  KEY_TAB:       9,
+  KEY_RETURN:   13,
+  KEY_ESC:      27,
+  KEY_LEFT:     37,
+  KEY_UP:       38,
+  KEY_RIGHT:    39,
+  KEY_DOWN:     40,
+  KEY_DELETE:   46,
+  KEY_HOME:     36,
+  KEY_END:      35,
+  KEY_PAGEUP:   33,
+  KEY_PAGEDOWN: 34,
+  KEY_INSERT:   45,
+
+  cache: { },
+
+  relatedTarget: function(event) {
+    var element;
+    switch(event.type) {
+      case 'mouseover': element = event.fromElement; break;
+      case 'mouseout':  element = event.toElement;   break;
+      default: return null;
+    }
+    return Element.extend(element);
+  }
+});
+
+Event.Methods = (function() {
+  var isButton;
+
+  if (Prototype.Browser.IE) {
+    var buttonMap = { 0: 1, 1: 4, 2: 2 };
+    isButton = function(event, code) {
+      return event.button == buttonMap[code];
+    };
+
+  } else if (Prototype.Browser.WebKit) {
+    isButton = function(event, code) {
+      switch (code) {
+        case 0: return event.which == 1 && !event.metaKey;
+        case 1: return event.which == 1 && event.metaKey;
+        default: return false;
+      }
+    };
+
+  } else {
+    isButton = function(event, code) {
+      return event.which ? (event.which === code + 1) : (event.button === code);
+    };
+  }
+
+  return {
+    isLeftClick:   function(event) { return isButton(event, 0) },
+    isMiddleClick: function(event) { return isButton(event, 1) },
+    isRightClick:  function(event) { return isButton(event, 2) },
+
+    element: function(event) {
+      var node = Event.extend(event).target;
+      return Element.extend(node.nodeType == Node.TEXT_NODE ? node.parentNode : node);
+    },
+
+    findElement: function(event, expression) {
+      var element = Event.element(event);
+      if (!expression) return element;
+      var elements = [element].concat(element.ancestors());
+      return Selector.findElement(elements, expression, 0);
+    },
+
+    pointer: function(event) {
+      return {
+        x: event.pageX || (event.clientX +
+          (document.documentElement.scrollLeft || document.body.scrollLeft)),
+        y: event.pageY || (event.clientY +
+          (document.documentElement.scrollTop || document.body.scrollTop))
+      };
+    },
+
+    pointerX: function(event) { return Event.pointer(event).x },
+    pointerY: function(event) { return Event.pointer(event).y },
+
+    stop: function(event) {
+      Event.extend(event);
+      event.preventDefault();
+      event.stopPropagation();
+      event.stopped = true;
+    }
+  };
+})();
+
+Event.extend = (function() {
+  var methods = Object.keys(Event.Methods).inject({ }, function(m, name) {
+    m[name] = Event.Methods[name].methodize();
+    return m;
+  });
+
+  if (Prototype.Browser.IE) {
+    Object.extend(methods, {
+      stopPropagation: function() { this.cancelBubble = true },
+      preventDefault:  function() { this.returnValue = false },
+      inspect: function() { return "[object Event]" }
+    });
+
+    return function(event) {
+      if (!event) return false;
+      if (event._extendedByPrototype) return event;
+
+      event._extendedByPrototype = Prototype.emptyFunction;
+      var pointer = Event.pointer(event);
+      Object.extend(event, {
+        target: event.srcElement,
+        relatedTarget: Event.relatedTarget(event),
+        pageX:  pointer.x,
+        pageY:  pointer.y
+      });
+      return Object.extend(event, methods);
+    };
+
+  } else {
+    Event.prototype = Event.prototype || document.createEvent("HTMLEvents").__proto__;
+    Object.extend(Event.prototype, methods);
+    return Prototype.K;
+  }
+})();
+
+Object.extend(Event, (function() {
+  var cache = Event.cache;
+
+  function getEventID(element) {
+    if (element._prototypeEventID) return element._prototypeEventID[0];
+    arguments.callee.id = arguments.callee.id || 1;
+    return element._prototypeEventID = [++arguments.callee.id];
+  }
+
+  function getDOMEventName(eventName) {
+    if (eventName && eventName.include(':')) return "dataavailable";
+    return eventName;
+  }
+
+  function getCacheForID(id) {
+    return cache[id] = cache[id] || { };
+  }
+
+  function getWrappersForEventName(id, eventName) {
+    var c = getCacheForID(id);
+    return c[eventName] = c[eventName] || [];
+  }
+
+  function createWrapper(element, eventName, handler) {
+    var id = getEventID(element);
+    var c = getWrappersForEventName(id, eventName);
+    if (c.pluck("handler").include(handler)) return false;
+
+    var wrapper = function(event) {
+      if (!Event || !Event.extend ||
+        (event.eventName && event.eventName != eventName))
+          return false;
+
+      Event.extend(event);
+      handler.call(element, event);
+    };
+
+    wrapper.handler = handler;
+    c.push(wrapper);
+    return wrapper;
+  }
+
+  function findWrapper(id, eventName, handler) {
+    var c = getWrappersForEventName(id, eventName);
+    return c.find(function(wrapper) { return wrapper.handler == handler });
+  }
+
+  function destroyWrapper(id, eventName, handler) {
+    var c = getCacheForID(id);
+    if (!c[eventName]) return false;
+    c[eventName] = c[eventName].without(findWrapper(id, eventName, handler));
+  }
+
+  function destroyCache() {
+    for (var id in cache)
+      for (var eventName in cache[id])
+        cache[id][eventName] = null;
+  }
+
+  if (window.attachEvent) {
+    window.attachEvent("onunload", destroyCache);
+  }
+
+  return {
+    observe: function(element, eventName, handler) {
+      element = $(element);
+      var name = getDOMEventName(eventName);
+
+      var wrapper = createWrapper(element, eventName, handler);
+      if (!wrapper) return element;
+
+      if (element.addEventListener) {
+        element.addEventListener(name, wrapper, false);
+      } else {
+        element.attachEvent("on" + name, wrapper);
+      }
+
+      return element;
+    },
+
+    stopObserving: function(element, eventName, handler) {
+      element = $(element);
+      var id = getEventID(element), name = getDOMEventName(eventName);
+
+      if (!handler && eventName) {
+        getWrappersForEventName(id, eventName).each(function(wrapper) {
+          element.stopObserving(eventName, wrapper.handler);
+        });
+        return element;
+
+      } else if (!eventName) {
+        Object.keys(getCacheForID(id)).each(function(eventName) {
+          element.stopObserving(eventName);
+        });
+        return element;
+      }
+
+      var wrapper = findWrapper(id, eventName, handler);
+      if (!wrapper) return element;
+
+      if (element.removeEventListener) {
+        element.removeEventListener(name, wrapper, false);
+      } else {
+        element.detachEvent("on" + name, wrapper);
+      }
+
+      destroyWrapper(id, eventName, handler);
+
+      return element;
+    },
+
+    fire: function(element, eventName, memo) {
+      element = $(element);
+      if (element == document && document.createEvent && !element.dispatchEvent)
+        element = document.documentElement;
+
+      var event;
+      if (document.createEvent) {
+        event = document.createEvent("HTMLEvents");
+        event.initEvent("dataavailable", true, true);
+      } else {
+        event = document.createEventObject();
+        event.eventType = "ondataavailable";
+      }
+
+      event.eventName = eventName;
+      event.memo = memo || { };
+
+      if (document.createEvent) {
+        element.dispatchEvent(event);
+      } else {
+        element.fireEvent(event.eventType, event);
+      }
+
+      return Event.extend(event);
+    }
+  };
+})());
+
+Object.extend(Event, Event.Methods);
+
+Element.addMethods({
+  fire:          Event.fire,
+  observe:       Event.observe,
+  stopObserving: Event.stopObserving
+});
+
+Object.extend(document, {
+  fire:          Element.Methods.fire.methodize(),
+  observe:       Element.Methods.observe.methodize(),
+  stopObserving: Element.Methods.stopObserving.methodize(),
+  loaded:        false
 });
 
-/* prevent memory leaks in IE */
-if (Prototype.Browser.IE)
-	Event.observe(window, 'unload', Event.unloadCache, false);
+(function() {
+  /* Support for the DOMContentLoaded event is based on work by Dan Webb,
+     Matthias Miller, Dean Edwards and John Resig. */
+
+  var timer;
+
+  function fireContentLoadedEvent() {
+    if (document.loaded) return;
+    if (timer) window.clearInterval(timer);
+    document.fire("dom:loaded");
+    document.loaded = true;
+  }
+
+  if (document.addEventListener) {
+    if (Prototype.Browser.WebKit) {
+      timer = window.setInterval(function() {
+        if (/loaded|complete/.test(document.readyState))
+          fireContentLoadedEvent();
+      }, 0);
+
+      Event.observe(window, "load", fireContentLoadedEvent);
+
+    } else {
+      document.addEventListener("DOMContentLoaded",
+        fireContentLoadedEvent, false);
+    }
+
+  } else {
+    document.write("<script id=__onDOMContentLoaded defer src=//:><\/script>");
+    $("__onDOMContentLoaded").onreadystatechange = function() {
+      if (this.readyState == "complete") {
+        this.onreadystatechange = null;
+        fireContentLoadedEvent();
+      }
+    };
+  }
+})();
+/*------------------------------- DEPRECATED -------------------------------*/
+
+Hash.toQueryString = Object.toQueryString;
+
+var Toggle = { display: Element.toggle };
+
+Element.Methods.childOf = Element.Methods.descendantOf;
+
+var Insertion = {
+  Before: function(element, content) {
+    return Element.insert(element, {before:content});
+  },
+
+  Top: function(element, content) {
+    return Element.insert(element, {top:content});
+  },
+
+  Bottom: function(element, content) {
+    return Element.insert(element, {bottom:content});
+  },
+
+  After: function(element, content) {
+    return Element.insert(element, {after:content});
+  }
+};
+
+var $continue = new Error('"throw $continue" is deprecated, use "return" instead');
+
+// This should be moved to script.aculo.us; notice the deprecated methods
+// further below, that map to the newer Element methods.
 var Position = {
-	// set to true if needed, warning: firefox performance problems
-	// NOT neeeded for page scrolling, only if draggable contained in
-	// scrollable elements
-	includeScrollOffsets: false,
-
-	// must be called before calling withinIncludingScrolloffset, every time the
-	// page is scrolled
-	prepare: function() {
-		this.deltaX =  window.pageXOffset
-								|| document.documentElement.scrollLeft
-								|| document.body.scrollLeft
-								|| 0;
-		this.deltaY =  window.pageYOffset
-								|| document.documentElement.scrollTop
-								|| document.body.scrollTop
-								|| 0;
-	},
-
-	realOffset: function(element) {
-		var valueT = 0, valueL = 0;
-		do {
-			valueT += element.scrollTop  || 0;
-			valueL += element.scrollLeft || 0;
-			element = element.parentNode;
-		} while (element);
-		return [valueL, valueT];
-	},
-
-	cumulativeOffset: function(element) {
-		var valueT = 0, valueL = 0;
-		do {
-			valueT += element.offsetTop  || 0;
-			valueL += element.offsetLeft || 0;
-			element = element.offsetParent;
-		} while (element);
-		return [valueL, valueT];
-	},
-
-	positionedOffset: function(element) {
-		var valueT = 0, valueL = 0;
-		do {
-			valueT += element.offsetTop  || 0;
-			valueL += element.offsetLeft || 0;
-			element = element.offsetParent;
-			if (element) {
-				if(element.tagName=='BODY') break;
-				var p = Element.getStyle(element, 'position');
-				if (p == 'relative' || p == 'absolute') break;
-			}
-		} while (element);
-		return [valueL, valueT];
-	},
-
-	offsetParent: function(element) {
-		if (element.offsetParent) return element.offsetParent;
-		if (element == document.body) return element;
-
-		while ((element = element.parentNode) && element != document.body)
-			if (Element.getStyle(element, 'position') != 'static')
-				return element;
-
-		return document.body;
-	},
-
-	// caches x/y coordinate pair to use with overlap
-	within: function(element, x, y) {
-		if (this.includeScrollOffsets)
-			return this.withinIncludingScrolloffsets(element, x, y);
-		this.xcomp = x;
-		this.ycomp = y;
-		this.offset = this.cumulativeOffset(element);
-
-		return (y >= this.offset[1] &&
-						y <  this.offset[1] + element.offsetHeight &&
-						x >= this.offset[0] &&
-						x <  this.offset[0] + element.offsetWidth);
-	},
-
-	withinIncludingScrolloffsets: function(element, x, y) {
-		var offsetcache = this.realOffset(element);
-
-		this.xcomp = x + offsetcache[0] - this.deltaX;
-		this.ycomp = y + offsetcache[1] - this.deltaY;
-		this.offset = this.cumulativeOffset(element);
-
-		return (this.ycomp >= this.offset[1] &&
-						this.ycomp <  this.offset[1] + element.offsetHeight &&
-						this.xcomp >= this.offset[0] &&
-						this.xcomp <  this.offset[0] + element.offsetWidth);
-	},
-
-	// within must be called directly before
-	overlap: function(mode, element) {
-		if (!mode) return 0;
-		if (mode == 'vertical')
-			return ((this.offset[1] + element.offsetHeight) - this.ycomp) /
-				element.offsetHeight;
-		if (mode == 'horizontal')
-			return ((this.offset[0] + element.offsetWidth) - this.xcomp) /
-				element.offsetWidth;
-	},
-
-	page: function(forElement) {
-		var valueT = 0, valueL = 0;
-
-		var element = forElement;
-		do {
-			valueT += element.offsetTop  || 0;
-			valueL += element.offsetLeft || 0;
-
-			// Safari fix
-			if (element.offsetParent == document.body)
-				if (Element.getStyle(element,'position')=='absolute') break;
-
-		} while (element = element.offsetParent);
-
-		element = forElement;
-		do {
-			if (!window.opera || element.tagName=='BODY') {
-				valueT -= element.scrollTop  || 0;
-				valueL -= element.scrollLeft || 0;
-			}
-		} while (element = element.parentNode);
-
-		return [valueL, valueT];
-	},
-
-	clone: function(source, target) {
-		var options = Object.extend({
-			setLeft:    true,
-			setTop:     true,
-			setWidth:   true,
-			setHeight:  true,
-			offsetTop:  0,
-			offsetLeft: 0
-		}, arguments[2] || {})
-
-		// find page position of source
-		source = $(source);
-		var p = Position.page(source);
-
-		// find coordinate system to use
-		target = $(target);
-		var delta = [0, 0];
-		var parent = null;
-		// delta [0,0] will do fine with position: fixed elements,
-		// position:absolute needs offsetParent deltas
-		if (Element.getStyle(target,'position') == 'absolute') {
-			parent = Position.offsetParent(target);
-			delta = Position.page(parent);
-		}
-
-		// correct by body offsets (fixes Safari)
-		if (parent == document.body) {
-			delta[0] -= document.body.offsetLeft;
-			delta[1] -= document.body.offsetTop;
-		}
-
-		// set position
-		if(options.setLeft)   target.style.left  = (p[0] - delta[0] + options.offsetLeft) + 'px';
-		if(options.setTop)    target.style.top   = (p[1] - delta[1] + options.offsetTop) + 'px';
-		if(options.setWidth)  target.style.width = source.offsetWidth + 'px';
-		if(options.setHeight) target.style.height = source.offsetHeight + 'px';
-	},
-
-	absolutize: function(element) {
-		element = $(element);
-		if (element.style.position == 'absolute') return;
-		Position.prepare();
-
-		var offsets = Position.positionedOffset(element);
-		var top     = offsets[1];
-		var left    = offsets[0];
-		var width   = element.clientWidth;
-		var height  = element.clientHeight;
-
-		element._originalLeft   = left - parseFloat(element.style.left  || 0);
-		element._originalTop    = top  - parseFloat(element.style.top || 0);
-		element._originalWidth  = element.style.width;
-		element._originalHeight = element.style.height;
-
-		element.style.position = 'absolute';
-		element.style.top    = top + 'px';
-		element.style.left   = left + 'px';
-		element.style.width  = width + 'px';
-		element.style.height = height + 'px';
-	},
-
-	relativize: function(element) {
-		element = $(element);
-		if (element.style.position == 'relative') return;
-		Position.prepare();
-
-		element.style.position = 'relative';
-		var top  = parseFloat(element.style.top  || 0) - (element._originalTop || 0);
-		var left = parseFloat(element.style.left || 0) - (element._originalLeft || 0);
-
-		element.style.top    = top + 'px';
-		element.style.left   = left + 'px';
-		element.style.height = element._originalHeight;
-		element.style.width  = element._originalWidth;
-	}
-}
+  // set to true if needed, warning: firefox performance problems
+  // NOT neeeded for page scrolling, only if draggable contained in
+  // scrollable elements
+  includeScrollOffsets: false,
+
+  // must be called before calling withinIncludingScrolloffset, every time the
+  // page is scrolled
+  prepare: function() {
+    this.deltaX =  window.pageXOffset
+                || document.documentElement.scrollLeft
+                || document.body.scrollLeft
+                || 0;
+    this.deltaY =  window.pageYOffset
+                || document.documentElement.scrollTop
+                || document.body.scrollTop
+                || 0;
+  },
+
+  // caches x/y coordinate pair to use with overlap
+  within: function(element, x, y) {
+    if (this.includeScrollOffsets)
+      return this.withinIncludingScrolloffsets(element, x, y);
+    this.xcomp = x;
+    this.ycomp = y;
+    this.offset = Element.cumulativeOffset(element);
+
+    return (y >= this.offset[1] &&
+            y <  this.offset[1] + element.offsetHeight &&
+            x >= this.offset[0] &&
+            x <  this.offset[0] + element.offsetWidth);
+  },
+
+  withinIncludingScrolloffsets: function(element, x, y) {
+    var offsetcache = Element.cumulativeScrollOffset(element);
+
+    this.xcomp = x + offsetcache[0] - this.deltaX;
+    this.ycomp = y + offsetcache[1] - this.deltaY;
+    this.offset = Element.cumulativeOffset(element);
+
+    return (this.ycomp >= this.offset[1] &&
+            this.ycomp <  this.offset[1] + element.offsetHeight &&
+            this.xcomp >= this.offset[0] &&
+            this.xcomp <  this.offset[0] + element.offsetWidth);
+  },
+
+  // within must be called directly before
+  overlap: function(mode, element) {
+    if (!mode) return 0;
+    if (mode == 'vertical')
+      return ((this.offset[1] + element.offsetHeight) - this.ycomp) /
+        element.offsetHeight;
+    if (mode == 'horizontal')
+      return ((this.offset[0] + element.offsetWidth) - this.xcomp) /
+        element.offsetWidth;
+  },
+
+  // Deprecation layer -- use newer Element methods now (1.5.2).
+
+  cumulativeOffset: Element.Methods.cumulativeOffset,
+
+  positionedOffset: Element.Methods.positionedOffset,
+
+  absolutize: function(element) {
+    Position.prepare();
+    return Element.absolutize(element);
+  },
+
+  relativize: function(element) {
+    Position.prepare();
+    return Element.relativize(element);
+  },
+
+  realOffset: Element.Methods.cumulativeScrollOffset,
+
+  offsetParent: Element.Methods.getOffsetParent,
+
+  page: Element.Methods.viewportOffset,
+
+  clone: function(source, target, options) {
+    options = options || { };
+    return Element.clonePosition(target, source, options);
+  }
+};
 
-// Safari returns margins on body which is incorrect if the child is absolutely
-// positioned.  For performance reasons, redefine Position.cumulativeOffset for
-// KHTML/WebKit only.
-if (Prototype.Browser.WebKit) {
-	Position.cumulativeOffset = function(element) {
-		var valueT = 0, valueL = 0;
-		do {
-			valueT += element.offsetTop  || 0;
-			valueL += element.offsetLeft || 0;
-			if (element.offsetParent == document.body)
-				if (Element.getStyle(element, 'position') == 'absolute') break;
-
-			element = element.offsetParent;
-		} while (element);
-
-		return [valueL, valueT];
-	}
-}
+/*--------------------------------------------------------------------------*/
+
+if (!document.getElementsByClassName) document.getElementsByClassName = function(instanceMethods){
+  function iter(name) {
+    return name.blank() ? null : "[contains(concat(' ', @class, ' '), ' " + name + " ')]";
+  }
+
+  instanceMethods.getElementsByClassName = Prototype.BrowserFeatures.XPath ?
+  function(element, className) {
+    className = className.toString().strip();
+    var cond = /\s/.test(className) ? $w(className).map(iter).join('') : iter(className);
+    return cond ? document._getElementsByXPath('.//*' + cond, element) : [];
+  } : function(element, className) {
+    className = className.toString().strip();
+    var elements = [], classNames = (/\s/.test(className) ? $w(className) : null);
+    if (!classNames && !className) return elements;
+
+    var nodes = $(element).getElementsByTagName('*');
+    className = ' ' + className + ' ';
+
+    for (var i = 0, child, cn; child = nodes[i]; i++) {
+      if (child.className && (cn = ' ' + child.className + ' ') && (cn.include(className) ||
+          (classNames && classNames.all(function(name) {
+            return !name.toString().blank() && cn.include(' ' + name + ' ');
+          }))))
+        elements.push(Element.extend(child));
+    }
+    return elements;
+  };
+
+  return function(className, parentElement) {
+    return $(parentElement || document.body).getElementsByClassName(className);
+  };
+}(Element.Methods);
+
+/*--------------------------------------------------------------------------*/
+
+Element.ClassNames = Class.create();
+Element.ClassNames.prototype = {
+  initialize: function(element) {
+    this.element = $(element);
+  },
+
+  _each: function(iterator) {
+    this.element.className.split(/\s+/).select(function(name) {
+      return name.length > 0;
+    })._each(iterator);
+  },
+
+  set: function(className) {
+    this.element.className = className;
+  },
+
+  add: function(classNameToAdd) {
+    if (this.include(classNameToAdd)) return;
+    this.set($A(this).concat(classNameToAdd).join(' '));
+  },
+
+  remove: function(classNameToRemove) {
+    if (!this.include(classNameToRemove)) return;
+    this.set($A(this).without(classNameToRemove).join(' '));
+  },
+
+  toString: function() {
+    return $A(this).join(' ');
+  }
+};
+
+Object.extend(Element.ClassNames.prototype, Enumerable);
+
+/*--------------------------------------------------------------------------*/
 
 Element.addMethods();
\ No newline at end of file