/*  Prototype JavaScript framework, version 1.5.1.1
 *  (c) 2005-2007 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 }
}

var Class = {
	create: function() {
		return function() {
			this.initialize.apply(this, arguments);
		}
	}
}

var Abstract = new Object();

Object.extend = function(destination, source) {
	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);
	}
});

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';
	}
});

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) + '"';
};

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;
	}
}

/*--------------------------------------------------------------------------*/

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;
			}
		}
	}
}
Object.extend(String, {
	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);
	}
});

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,'>');
	}
});

String.prototype.gsub.prepareReplacement = function(replacement) {
	if (typeof replacement == 'function') 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('')
});

with (String.prototype.escapeHTML) div.appendChild(text);

var Template = Class.create();
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 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() + '>';
	}
}

Object.extend(Enumerable, {
	map:     Enumerable.collect,
	find:    Enumerable.detect,
	select:  Enumerable.findAll,
	member:  Enumerable.include,
	entries: Enumerable.toArray
});
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;
	}
}

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;
		}
	}
}

Object.extend(Array.prototype, Enumerable);

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(', ') + ']';
	}
});

Array.prototype.toArray = Array.prototype.clone;

function $w(string) {
	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;
	}
}
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(', ') + '}';
	}
});

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);
	}
});

function $H(object) {
	if (object instanceof Hash) return 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 $R = function(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
}

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) {}
			}
		});
	}
};

Object.extend(Ajax.Responders, Enumerable);

Ajax.Responders.register({
	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.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);
	}
});

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.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);
	}
});
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 (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;
};

/*--------------------------------------------------------------------------*/

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;
};

Element.extend.cache = {
	findOrStore: function(value) {
		return this[value] = this[value] || function() {
			return value.apply(null, [this].concat($A(arguments)));
		}
	}
};

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;
	}
};

Object.extend(Element.Methods, {
	childOf: Element.Methods.descendantOf,
	childElements: Element.Methods.immediateDescendants
});

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);
		}
	};
}
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;
	}
}
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;
	};
}

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;
		}
	}
};

(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);

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;
	}
};

Element.Methods.ByTag = {};

Object.extend(Element, Element.Methods);

if (!Prototype.BrowserFeatures.ElementExtensions &&
 document.createElement('div').__proto__) {
	window.HTMLElement = {};
	window.HTMLElement.prototype = document.createElement('div').__proto__;
	Prototype.BrowserFeatures.ElementExtensions = true;
}

Element.hasAttribute = function(element, attribute) {
	if (element.hasAttribute) return element.hasAttribute(attribute);
	return Element.Methods.Simulated.hasAttribute(element, attribute);
};

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;
};

var Toggle = { display: Element.toggle };

/*--------------------------------------------------------------------------*/

Abstract.Insertion = function(adjacency) {
	this.adjacency = adjacency;
}

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);
	}
}

var Insertion = new Object();

Insertion.Before = Class.create();
Insertion.Before.prototype = Object.extend(new Abstract.Insertion('beforeBegin'), {
	initializeRange: function() {
		this.range.setStartBefore(this.element);
	},

	insertContent: function(fragments) {
		fragments.each((function(fragment) {
			this.element.parentNode.insertBefore(fragment, this.element);
		}).bind(this));
	}
});

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));
	}
});

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));
	}
});

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));
	}
});

/*--------------------------------------------------------------------------*/

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);
/* 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() + ">";
	}
};

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;
	}
});

function $$() {
	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);
	}
};

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);
	}
}

/*--------------------------------------------------------------------------*/

Form.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;
	}
}

/*--------------------------------------------------------------------------*/

var Field = Form.Element;
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;
	}
}

/*--------------------------------------------------------------------------*/

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;
		}
	}
}

Form.Element.Observer = Class.create();
Form.Element.Observer.prototype = Object.extend(new 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);
	}
});

/*--------------------------------------------------------------------------*/

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;
			}
		}
	}
}

Form.Element.EventObserver = Class.create();
Form.Element.EventObserver.prototype = Object.extend(new 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);
	}
});
if (!window.Event) {
	var Event = new Object();
}

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) {}
		}
	}
});

/* prevent memory leaks in IE */
if (Prototype.Browser.IE)
	Event.observe(window, 'unload', Event.unloadCache, false);
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;
	}
}

// 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];
	}
}

Element.addMethods();