- admin, comments and tags pages include page_header later in the code (as in picture and index) allowing plugins to change the header until the very end

- fix in admin.php : picture_modify requires cache invalidation
- fix in site_update.php : some echo func calls changed to $template->output .= ...
- upgraded prototype.js to latest version 1.5.1.1

git-svn-id: http://piwigo.org/svn/trunk@2107 68402e56-0260-453c-a942-63ccdbb3a9ee

6 files changed, 3057 insertions, 2305 deletions

diff --git a/admin.php b/admin.php
index 004bac218..c327010b3 100644
--- a/admin.php
+++ b/admin.php
@@ -74,7 +74,6 @@ $conf_link = $link_start.'configuration&section=';
 $title = l10n('PhpWebGallery Administration'); // for include/page_header.php
 $page['page_banner'] = '<h1>'.l10n('PhpWebGallery Administration').'</h1>';
 $page['body_id'] = 'theAdminPage';
-include(PHPWG_ROOT_PATH.'include/page_header.php');
 
 $template->set_filenames(array('admin' => 'admin.tpl'));
 
@@ -115,7 +114,7 @@ if ($conf['ws_access_control']) // Do we need to display ws_checker
     );
 }
 
-// required before plugin page inclusion
+//---------------------------------------------------------------- plugin menus
 $plugin_menu_links = array(
     array(
       'NAME' => l10n('admin'),
@@ -124,16 +123,15 @@ $plugin_menu_links = array(
   );
 $plugin_menu_links = trigger_event('get_admin_plugin_menu_links',
   $plugin_menu_links );
-
-
-include(PHPWG_ROOT_PATH.'admin/'.$page['page'].'.php');
-
-//------------------------------------------------------------- content display
 foreach ($plugin_menu_links as $menu_item)
 {
   $template->assign_block_vars('plugin_menu.menu_item', $menu_item);
 }
 
+include(PHPWG_ROOT_PATH.'admin/'.$page['page'].'.php');
+
+//------------------------------------------------------------- content display
+
 // +-----------------------------------------------------------------------+
 // |                            errors & infos                             |
 // +-----------------------------------------------------------------------+
@@ -154,6 +152,7 @@ if (count($page['infos']) != 0)
   }
 }
 
+include(PHPWG_ROOT_PATH.'include/page_header.php');
 $template->parse('admin');
 
 // +-----------------------------------------------------------------------+
@@ -171,6 +170,7 @@ if (
         'cat_options',  // ?only POST; public/private; lock/unlock
         'cat_perm',     // ?only POST
         'element_set',  // ?only POST; associate/dissociate
+        'picture_modify', // ?only POST; associate/dissociate
         'user_list',    // ?only POST; group assoc
         'user_perm',
         'group_perm',
diff --git a/admin/site_update.php b/admin/site_update.php
index 7e83d62fb..f19b10d1e 100644
--- a/admin/site_update.php
+++ b/admin/site_update.php
@@ -231,7 +231,6 @@ SELECT IF(MAX(id)+1 IS NULL, 1, MAX(id)+1) AS next_id
 
   // retrieve sub-directories fulldirs from the site reader
   $fs_fulldirs = $site_reader->get_full_directories($basedir);
-  //print_r( $fs_fulldirs ); echo "<br>";
 
   // get_full_directories doesn't include the base directory, so if it's a
   // category directory, we need to include it in our array
@@ -352,9 +351,9 @@ SELECT IF(MAX(id)+1 IS NULL, 1, MAX(id)+1) AS next_id
     $counts['del_categories'] = count($to_delete);
   }
 
-  echo '<!-- scanning dirs : ';
-  echo get_elapsed_time($start, get_moment());
-  echo ' -->'."\n";
+  $template->output .= '<!-- scanning dirs : '
+    . get_elapsed_time($start, get_moment())
+    . ' -->'."\n";
 }
 // +-----------------------------------------------------------------------+
 // |                           files / elements                            |
@@ -366,8 +365,9 @@ if (isset($_POST['submit']) and $_POST['sync'] == 'files'
   $start= $start_files;
 
   $fs = $site_reader->get_elements($basedir);
-  //print_r($fs); echo "<br>";
-  echo '<!-- get_elements: '.get_elapsed_time($start, get_moment())." -->\n";
+  $template->output .= '<!-- get_elements: '
+    . get_elapsed_time($start, get_moment())
+    . " -->\n";
 
   $cat_ids = array_diff(array_keys($db_categories), $to_delete);
 
@@ -571,9 +571,9 @@ SELECT IF(MAX(id)+1 IS NULL, 1, MAX(id)+1) AS next_element_id
     $counts['del_elements'] = count($to_delete_elements);
   }
 
-  echo '<!-- scanning files : ';
-  echo get_elapsed_time($start_files, get_moment());
-  echo ' -->'."\n";
+  $template->output .= '<!-- scanning files : '
+    . get_elapsed_time($start_files, get_moment())
+    . ' -->'."\n";
 
   // retrieving informations given by uploaders
   if (!$simulate and count($cat_ids) > 0)
@@ -643,15 +643,15 @@ if (isset($_POST['submit'])
   {
     $start = get_moment();
     update_category('all');
-    echo '<!-- update_category(all) : ';
-    echo get_elapsed_time($start,get_moment());
-    echo ' -->'."\n";
+    $template->output .= '<!-- update_category(all) : '
+      . get_elapsed_time($start,get_moment())
+      . ' -->'."\n";
     $start = get_moment();
     ordering();
     update_global_rank();
-    echo '<!-- ordering categories : ';
-    echo get_elapsed_time($start, get_moment());
-    echo ' -->'."\n";
+    $template->output .= '<!-- ordering categories : '
+      . get_elapsed_time($start, get_moment())
+      . ' -->'."\n";
   }
 
   if ($_POST['sync'] == 'files')
@@ -670,9 +670,9 @@ if (isset($_POST['submit'])
     $files = get_filelist($opts['category_id'], $site_id,
                           $opts['recursive'],
                           false);
-    echo '<!-- get_filelist : ';
-    echo get_elapsed_time($start, get_moment());
-    echo ' -->'."\n";
+    $template->output .= '<!-- get_filelist : '
+      . get_elapsed_time($start, get_moment())
+      . ' -->'."\n";
     $start = get_moment();
 
     $datas = array();
@@ -716,9 +716,9 @@ if (isset($_POST['submit'])
         $datas
         );
     }
-    echo '<!-- update files : ';
-    echo get_elapsed_time($start,get_moment());
-    echo ' -->'."\n";
+    $template->output .= '<!-- update files : '
+      . get_elapsed_time($start,get_moment())
+      . ' -->'."\n";
   }// end if sync files
 }
 
@@ -772,9 +772,9 @@ if (isset($_POST['submit']) and preg_match('/^metadata/', $_POST['sync'])
                         $opts['recursive'],
                         $opts['only_new']);
 
-  echo '<!-- get_filelist : ';
-  echo get_elapsed_time($start, get_moment());
-  echo ' -->'."\n";
+  $template->output .= '<!-- get_filelist : '
+    . get_elapsed_time($start, get_moment())
+    . ' -->'."\n";
 
   $start = get_moment();
   $datas = array();
@@ -805,14 +805,14 @@ SELECT id
       array_push($has_high_images, $row['id']);
     }
   }
-  
+
   foreach ( $files as $id=>$file )
   {
     $data = $site_reader->get_element_metadata(
       $file,
       in_array($id, $has_high_images)
       );
-    
+
     if ( is_array($data) )
     {
       $data['date_metadata_update'] = CURRENT_DATE;
@@ -848,8 +848,6 @@ SELECT id
   {
     if (count($datas) > 0)
     {
-      // echo '<pre>', print_r($datas); echo '</pre>';
-      
       mass_updates(
         IMAGES_TABLE,
         // fields
@@ -871,9 +869,9 @@ SELECT id
     set_tags_of($tags_of);
   }
 
-  echo '<!-- metadata update : ';
-  echo get_elapsed_time($start, get_moment());
-  echo ' -->'."\n";
+  $template->output .= '<!-- metadata update : '
+    . get_elapsed_time($start, get_moment())
+    . ' -->'."\n";
 
   $template->assign_block_vars(
     'metadata_result',
diff --git a/comments.php b/comments.php
index efcd7dfb5..e65662439 100644
--- a/comments.php
+++ b/comments.php
@@ -4,7 +4,6 @@
 // | Copyright (C) 2002-2003 Pierrick LE GALL - pierrick@phpwebgallery.net |
 // | Copyright (C) 2003-2007 PhpWebGallery Team - http://phpwebgallery.net |
 // +-----------------------------------------------------------------------+
-// | branch        : BSF (Best So Far)
 // | file          : $Id$
 // | last update   : $Date$
 // | last modifier : $Author$
@@ -175,7 +174,6 @@ UPDATE '.COMMENTS_TABLE.'
 
 $title= l10n('title_comments');
 $page['body_id'] = 'theCommentsPage';
-include(PHPWG_ROOT_PATH.'include/page_header.php');
 
 $template->set_filenames(array('comments'=>'comments.tpl'));
 $template->assign_vars(
@@ -442,7 +440,7 @@ SELECT id, name, permalink, uppercats
 // +-----------------------------------------------------------------------+
 // |                           html code display                           |
 // +-----------------------------------------------------------------------+
-$template->assign_block_vars('title',array());
+include(PHPWG_ROOT_PATH.'include/page_header.php');
 $template->parse('comments');
 include(PHPWG_ROOT_PATH.'include/page_tail.php');
-?>
+?>
\ No newline at end of file
diff --git a/tags.php b/tags.php
index 8ed0e36c6..582d9d504 100644
--- a/tags.php
+++ b/tags.php
@@ -59,7 +59,6 @@ check_status(ACCESS_GUEST);
 
 $title= l10n('Tags');
 $page['body_id'] = 'theTagsPage';
-include(PHPWG_ROOT_PATH.'include/page_header.php');
 
 $template->set_filenames(array('tags'=>'tags.tpl'));
 $template->assign_vars(
@@ -105,11 +104,7 @@ foreach ($tags as $tag)
     );
 }
 
-// +-----------------------------------------------------------------------+
-// |                           html code display                           |
-// +-----------------------------------------------------------------------+
-
-$template->assign_block_vars('title',array());
+include(PHPWG_ROOT_PATH.'include/page_header.php');
 $template->parse('tags');
 include(PHPWG_ROOT_PATH.'include/page_tail.php');
 ?>
\ No newline at end of file
diff --git a/template/yoga/theme/dark/theme.css b/template/yoga/theme/dark/theme.css
index 08459ebb6..e4bda2bd7 100644
--- a/template/yoga/theme/dark/theme.css
+++ b/template/yoga/theme/dark/theme.css
@@ -117,4 +117,3 @@ A.navThumb, A.navThumb:hover {
 }
 
 .virtual_cat { background: #3f3f3f !important; }
-#mbMenu #quicksearch > p { text-align: left; }
diff --git a/tools/prototype.js b/tools/prototype.js
index 505822177..c5a9ccc05 100644
--- a/tools/prototype.js
+++ b/tools/prototype.js
@@ -1,2515 +1,3277 @@
-/*  Prototype JavaScript framework, version 1.5.0
+/*  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://prototype.conio.net/
+ *  For details, see the Prototype web site: http://www.prototypejs.org/
  *
 /*--------------------------------------------------------------------------*/
 
 var Prototype = {
-  Version: '1.5.0',
-  BrowserFeatures: {
-    XPath: !!document.evaluate
-  },
-
-  ScriptFragment: '(?:<script.*?>)((\n|\r|.)*?)(?:<\/script>)',
-  emptyFunction: function() {},
-  K: function(x) { return x }
+	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);
-    }
-  }
+	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;
+	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;
-    }
-  },
-
-  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 === 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)));
-  }
+	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 = $A(arguments), object = args.shift();
-  return function(event) {
-    return __method.apply(object, [( event || window.event)].concat(args).concat($A(arguments)));
-  }
+	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() {
-    var digits = this.toString(16);
-    if (this < 16) return '0' + digits;
-    return digits;
-  },
-
-  succ: function() {
-    return this + 1;
-  },
-
-  times: function(iterator) {
-    $R(0, this, true).each(iterator);
-    return this;
-  }
+	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;
-  }
+	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;
-      }
-    }
-  }
-}
-String.interpret = function(value){
-  return value == null ? '' : String(value);
+	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 div = document.createElement('div');
-    var text = document.createTextNode(this);
-    div.appendChild(text);
-    return 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 name = decodeURIComponent(pair[0]);
-        var value = pair[1] ? decodeURIComponent(pair[1]) : undefined;
-
-        if (hash[name] !== undefined) {
-          if (hash[name].constructor != Array)
-            hash[name] = [hash[name]];
-          if (value) hash[name].push(value);
-        }
-        else hash[name] = 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);
-  },
-
-  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.replace(/\\/g, '\\\\');
-    if (useDoubleQuotes)
-      return '"' + escapedString.replace(/"/g, '\\"') + '"';
-    else
-      return "'" + escapedString.replace(/'/g, '\\\'') + "'";
-  }
+	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) };
+	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]]);
-    });
-  }
+	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    = new Object();
-var $continue = new Object();
+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) {
-        try {
-          iterator(value, index++);
-        } catch (e) {
-          if (e != $continue) throw e;
-        }
-      });
-    } 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) {
+		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
+	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 (!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;
+	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() {
-    return this.inject([], function(array, value) {
-      return array.include(value) ? array : array.concat([value]);
-    });
-  },
-
-  clone: function() {
-    return [].concat(this);
-  },
-
-  size: function() {
-    return this.length;
-  },
-
-  inspect: function() {
-    return '[' + this.map(Object.inspect).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(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+/) : [];
+function $w(string) {
+	string = string.strip();
+	return string ? string.split(/\s+/) : [];
 }
 
-if(window.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;
-  }
+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(obj) {
-  Object.extend(this, obj || {});
+var Hash = function(object) {
+	if (object instanceof Hash) this.merge(object);
+	else Object.extend(this, object || {});
 };
 
 Object.extend(Hash, {
-  toQueryString: function(obj) {
-    var parts = [];
-
-	  this.prototype._each.call(obj, function(pair) {
-      if (!pair.key) return;
-
-      if (pair.value && pair.value.constructor == Array) {
-        var values = pair.value.compact();
-        if (values.length < 2) pair.value = values.reduce();
-        else {
-        	key = encodeURIComponent(pair.key);
-          values.each(function(value) {
-            value = value != undefined ? encodeURIComponent(value) : '';
-            parts.push(key + '=' + encodeURIComponent(value));
-          });
-          return;
-        }
-      }
-      if (pair.value == undefined) pair[1] = '';
-      parts.push(pair.map(encodeURIComponent).join('='));
-	  });
-
-    return parts.join('&');
-  }
+	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(', ') + '}>';
-  }
+	_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 && object.constructor == Hash) return object;
-  return new Hash(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;
-  }
+	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 (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--;
-  }
+	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();
-  }
+	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'];
+	['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 = this.options.parameters;
-
-    if (!['get', 'post'].include(this.method)) {
-      // simulate other verbs over post
-      params['_method'] = this.method;
-      this.method = 'post';
-    }
-
-    params = Hash.toQueryString(params);
-    if (params && /Konqueror|Safari|KHTML/.test(navigator.userAgent)) params += '&_='
-
-    // when GET, append parameters to URL
-    if (this.method == 'get' && params)
-      this.url += (this.url.indexOf('?') > -1 ? '&' : '?') + params;
-
-    try {
-      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();
-
-      var body = this.method == 'post' ? (this.options.postBody || params) : null;
-
-      this.transport.send(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
-        $H(extras).each(function(pair) { headers[pair.key] = pair.value });
-    }
-
-    for (var name in headers)
-      this.transport.setRequestHeader(name, headers[name]);
-  },
-
-  success: function() {
-    return !this.transport.status
-        || (this.transport.status >= 200 && this.transport.status < 300);
-  },
-
-  respondToReadyState: function(readyState) {
-    var state = Ajax.Request.Events[readyState];
-    var transport = this.transport, json = this.evalJSON();
-
-    if (state == 'Complete') {
-      try {
-        this._complete = true;
-        (this.options['on' + this.transport.status]
-         || this.options['on' + (this.success() ? 'Success' : 'Failure')]
-         || Prototype.emptyFunction)(transport, json);
-      } catch (e) {
-        this.dispatchException(e);
-      }
-
-      if ((this.getHeader('Content-type') || 'text/javascript').strip().
-        match(/^(text|application)\/(x-)?(java|ecma)script(;.*)?$/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 ? eval('(' + json + ')') : null;
-    } catch (e) { return null }
-  },
-
-  evalResponse: function() {
-    try {
-      return eval(this.transport.responseText);
-    } catch (e) {
-      this.dispatchException(e);
-    }
-  },
-
-  dispatchException: function(exception) {
-    (this.options.onException || Prototype.emptyFunction)(this, exception);
-    Ajax.Responders.dispatch('onException', this, exception);
-  }
+	_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);
-    }
-  }
+	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);
-  }
+	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 (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, $(parentElement) || document,
-      null, XPathResult.ORDERED_NODE_SNAPSHOT_TYPE, null);
-    for (var i = 0, length = query.snapshotLength; i < length; i++)
-      results.push(query.snapshotItem(i));
-    return results;
-  };
-}
-
-document.getElementsByClassName = function(className, parentElement) {
-  if (Prototype.BrowserFeatures.XPath) {
-    var q = ".//*[contains(concat(' ', @class, ' '), ' " + className + " ')]";
-    return document._getElementsByXPath(q, parentElement);
-  } else {
-    var children = ($(parentElement) || document.body).getElementsByTagName('*');
-    var elements = [], child;
-    for (var i = 0, length = children.length; i < length; i++) {
-      child = children[i];
-      if (Element.hasClassName(child, className))
-        elements.push(Element.extend(child));
-    }
-    return elements;
-  }
+	document._getElementsByXPath = function(expression, parentElement) {
+		var results = [];
+		var query = document.evaluate(expression, $(parentElement) || document,
+			null, XPathResult.ORDERED_NODE_SNAPSHOT_TYPE, null);
+		for (var i = 0, length = query.snapshotLength; i < length; i++)
+			results.push(query.snapshotItem(i));
+		return results;
+	};
+
+	document.getElementsByClassName = function(className, parentElement) {
+		var q = ".//*[contains(concat(' ', @class, ' '), ' " + className + " ')]";
+		return document._getElementsByXPath(q, parentElement);
+	}
+
+} else document.getElementsByClassName = function(className, parentElement) {
+	var children = ($(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 = new Object();
+if (!window.Element) var Element = {};
 
 Element.extend = function(element) {
-  if (!element || _nativeExtensions || element.nodeType == 3) return element;
-
-  if (!element._extended && element.tagName && element != window) {
-    var methods = Object.clone(Element.Methods), cache = Element.extend.cache;
-
-    if (element.tagName == 'FORM')
-      Object.extend(methods, Form.Methods);
-    if (['INPUT', 'TEXTAREA', 'SELECT'].include(element.tagName))
-      Object.extend(methods, Form.Element.Methods);
-
-    Object.extend(methods, Element.Methods.Simulated);
-
-    for (var property in methods) {
-      var value = methods[property];
-      if (typeof value == 'function' && !(property in element))
-        element[property] = cache.findOrStore(value);
-    }
-  }
-
-  element._extended = true;
-  return 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($A(arguments)));
-    }
-  }
+	findOrStore: function(value) {
+		return this[value] = this[value] || function() {
+			return value.apply(null, [this].concat($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('*'));
-  },
-
-  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) {
-    return Selector.findElement($(element).ancestors(), expression, index);
-  },
-
-  down: function(element, expression, index) {
-    return Selector.findElement($(element).descendants(), expression, index);
-  },
-
-  previous: function(element, expression, index) {
-    return Selector.findElement($(element).previousSiblings(), expression, index);
-  },
-
-  next: function(element, expression, index) {
-    return Selector.findElement($(element).nextSiblings(), expression, index);
-  },
-
-  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 (document.all && !window.opera) {
-      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];
-      if(attribute) return attribute.nodeValue;
-    }
-    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 $(element).innerHTML.match(/^\s*$/);
-  },
-
-  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);
-    if (['float','cssFloat'].include(style))
-      style = (typeof element.style.styleFloat != 'undefined' ? 'styleFloat' : 'cssFloat');
-    style = style.camelize();
-    var value = element.style[style];
-    if (!value) {
-      if (document.defaultView && document.defaultView.getComputedStyle) {
-        var css = document.defaultView.getComputedStyle(element, null);
-        value = css ? css[style] : null;
-      } else if (element.currentStyle) {
-        value = element.currentStyle[style];
-      }
-    }
-
-    if((value == 'auto') && ['width','height'].include(style) && (element.getStyle('display') != 'none'))
-      value = element['offset'+style.capitalize()] + 'px';
-
-    if (window.opera && ['left', 'top', 'right', 'bottom'].include(style))
-      if (Element.getStyle(element, 'position') == 'static') value = 'auto';
-    if(style == 'opacity') {
-      if(value) return parseFloat(value);
-      if(value = (element.getStyle('filter') || '').match(/alpha\(opacity=(.*)\)/))
-        if(value[1]) return parseFloat(value[1]) / 100;
-      return 1.0;
-    }
-    return value == 'auto' ? null : value;
-  },
-
-  setStyle: function(element, style) {
-    element = $(element);
-    for (var name in style) {
-      var value = style[name];
-      if(name == 'opacity') {
-        if (value == 1) {
-          value = (/Gecko/.test(navigator.userAgent) &&
-            !/Konqueror|Safari|KHTML/.test(navigator.userAgent)) ? 0.999999 : 1.0;
-          if(/MSIE/.test(navigator.userAgent) && !window.opera)
-            element.style.filter = element.getStyle('filter').replace(/alpha\([^\)]*\)/gi,'');
-        } else if(value == '') {
-          if(/MSIE/.test(navigator.userAgent) && !window.opera)
-            element.style.filter = element.getStyle('filter').replace(/alpha\([^\)]*\)/gi,'');
-        } else {
-          if(value < 0.00001) value = 0;
-          if(/MSIE/.test(navigator.userAgent) && !window.opera)
-            element.style.filter = element.getStyle('filter').replace(/alpha\([^\)]*\)/gi,'') +
-              'alpha(opacity='+value*100+')';
-        }
-      } else if(['float','cssFloat'].include(name)) name = (typeof element.style.styleFloat != 'undefined') ? 'styleFloat' : 'cssFloat';
-      element.style[name.camelize()] = 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});
-
-Element._attributeTranslations = {};
-
-Element._attributeTranslations.names = {
-  colspan:   "colSpan",
-  rowspan:   "rowSpan",
-  valign:    "vAlign",
-  datetime:  "dateTime",
-  accesskey: "accessKey",
-  tabindex:  "tabIndex",
-  enctype:   "encType",
-  maxlength: "maxLength",
-  readonly:  "readOnly",
-  longdesc:  "longDesc"
+	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;
+	}
 };
 
-Element._attributeTranslations.values = {
-  _getAttr: function(element, attribute) {
-    return element.getAttribute(attribute, 2);
-  },
-
-  _flag: function(element, attribute) {
-    return $(element).hasAttribute(attribute) ? attribute : null;
-  },
+Object.extend(Element.Methods, {
+	childOf: Element.Methods.descendantOf,
+	childElements: Element.Methods.immediateDescendants
+});
 
-  style: function(element) {
-    return element.style.cssText.toLowerCase();
-  },
+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;
+	};
+}
 
-  title: function(element) {
-    var node = element.getAttributeNode('title');
-    return node.specified ? node.nodeValue : null;
-  }
+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;
+		}
+	}
 };
 
-Object.extend(Element._attributeTranslations.values, {
-  href: Element._attributeTranslations.values._getAttr,
-  src:  Element._attributeTranslations.values._getAttr,
-  disabled: Element._attributeTranslations.values._flag,
-  checked:  Element._attributeTranslations.values._flag,
-  readonly: Element._attributeTranslations.values._flag,
-  multiple: Element._attributeTranslations.values._flag
-});
+(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;
-    attribute = t.names[attribute] || attribute;
-    return $(element).getAttributeNode(attribute).specified;
-  }
+	hasAttribute: function(element, attribute) {
+		var t = Element._attributeTranslations, node;
+		attribute = t.names[attribute] || attribute;
+		node = $(element).getAttributeNode(attribute);
+		return node && node.specified;
+	}
 };
 
-// IE is missing .innerHTML support for TABLE-related elements
-if (document.all && !window.opera){
-  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;
-  }
-};
+Element.Methods.ByTag = {};
 
 Object.extend(Element, Element.Methods);
 
-var _nativeExtensions = false;
+if (!Prototype.BrowserFeatures.ElementExtensions &&
+ document.createElement('div').__proto__) {
+	window.HTMLElement = {};
+	window.HTMLElement.prototype = document.createElement('div').__proto__;
+	Prototype.BrowserFeatures.ElementExtensions = true;
+}
 
-if(/Konqueror|Safari|KHTML/.test(navigator.userAgent))
-  ['', 'Form', 'Input', 'TextArea', 'Select'].each(function(tag) {
-    var className = 'HTML' + tag + 'Element';
-    if(window[className]) return;
-    var klass = window[className] = {};
-    klass.prototype = document.createElement(tag ? tag.toLowerCase() : 'div').__proto__;
-  });
+Element.hasAttribute = function(element, attribute) {
+	if (element.hasAttribute) return element.hasAttribute(attribute);
+	return Element.Methods.Simulated.hasAttribute(element, attribute);
+};
 
 Element.addMethods = function(methods) {
-  Object.extend(Element.Methods, 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);
-    }
-  }
-
-  if (typeof HTMLElement != 'undefined') {
-    copy(Element.Methods, HTMLElement.prototype);
-    copy(Element.Methods.Simulated, HTMLElement.prototype, true);
-    copy(Form.Methods, HTMLFormElement.prototype);
-    [HTMLInputElement, HTMLTextAreaElement, HTMLSelectElement].each(function(klass) {
-      copy(Form.Element.Methods, klass.prototype);
-    });
-    _nativeExtensions = true;
-  }
-}
+	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 = new Object();
-Toggle.display = Element.toggle;
+var Toggle = { display: Element.toggle };
 
 /*--------------------------------------------------------------------------*/
 
 Abstract.Insertion = function(adjacency) {
-  this.adjacency = 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);
-  }
+	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));
-  }
+	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));
-  }
+	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));
-  }
+	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));
-  }
+	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(' ');
-  }
+	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.params = {classNames: []};
-    this.expression = expression.toString().strip();
-    this.parseExpression();
-    this.compileMatcher();
-  },
-
-  parseExpression: function() {
-    function abort(message) { throw 'Parse error in selector: ' + message; }
-
-    if (this.expression == '')  abort('empty expression');
-
-    var params = this.params, expr = this.expression, match, modifier, clause, rest;
-    while (match = expr.match(/^(.*)\[([a-z0-9_:-]+?)(?:([~\|!]?=)(?:"([^"]*)"|([^\]\s]*)))?\]$/i)) {
-      params.attributes = params.attributes || [];
-      params.attributes.push({name: match[2], operator: match[3], value: match[4] || match[5] || ''});
-      expr = match[1];
-    }
-
-    if (expr == '*') return this.params.wildcard = true;
-
-    while (match = expr.match(/^([^a-z0-9_-])?([a-z0-9_-]+)(.*)/i)) {
-      modifier = match[1], clause = match[2], rest = match[3];
-      switch (modifier) {
-        case '#':       params.id = clause; break;
-        case '.':       params.classNames.push(clause); break;
-        case '':
-        case undefined: params.tagName = clause.toUpperCase(); break;
-        default:        abort(expr.inspect());
-      }
-      expr = rest;
-    }
-
-    if (expr.length > 0) abort(expr.inspect());
-  },
-
-  buildMatchExpression: function() {
-    var params = this.params, conditions = [], clause;
-
-    if (params.wildcard)
-      conditions.push('true');
-    if (clause = params.id)
-      conditions.push('element.readAttribute("id") == ' + clause.inspect());
-    if (clause = params.tagName)
-      conditions.push('element.tagName.toUpperCase() == ' + clause.inspect());
-    if ((clause = params.classNames).length > 0)
-      for (var i = 0, length = clause.length; i < length; i++)
-        conditions.push('element.hasClassName(' + clause[i].inspect() + ')');
-    if (clause = params.attributes) {
-      clause.each(function(attribute) {
-        var value = 'element.readAttribute(' + attribute.name.inspect() + ')';
-        var splitValueBy = function(delimiter) {
-          return value + ' && ' + value + '.split(' + delimiter.inspect() + ')';
-        }
-
-        switch (attribute.operator) {
-          case '=':       conditions.push(value + ' == ' + attribute.value.inspect()); break;
-          case '~=':      conditions.push(splitValueBy(' ') + '.include(' + attribute.value.inspect() + ')'); break;
-          case '|=':      conditions.push(
-                            splitValueBy('-') + '.first().toUpperCase() == ' + attribute.value.toUpperCase().inspect()
-                          ); break;
-          case '!=':      conditions.push(value + ' != ' + attribute.value.inspect()); break;
-          case '':
-          case undefined: conditions.push('element.hasAttribute(' + attribute.name.inspect() + ')'); break;
-          default:        throw 'Unknown operator ' + attribute.operator + ' in selector';
-        }
-      });
-    }
-
-    return conditions.join(' && ');
-  },
-
-  compileMatcher: function() {
-    this.match = new Function('element', 'if (!element.tagName) return false; \
-      element = $(element); \
-      return ' + this.buildMatchExpression());
-  },
-
-  findElements: function(scope) {
-    var element;
-
-    if (element = $(this.params.id))
-      if (this.match(element))
-        if (!scope || Element.childOf(element, scope))
-          return [element];
-
-    scope = (scope || document).getElementsByTagName(this.params.tagName || '*');
-
-    var results = [];
-    for (var i = 0, length = scope.length; i < length; i++)
-      if (this.match(element = scope[i]))
-        results.push(Element.extend(element));
-
-    return results;
-  },
-
-  toString: function() {
-    return this.expression;
-  }
-}
+	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, {
-  matchElements: function(elements, expression) {
-    var selector = new Selector(expression);
-    return elements.select(selector.match.bind(selector)).map(Element.extend);
-  },
-
-  findElement: function(elements, expression, index) {
-    if (typeof expression == 'number') index = expression, expression = false;
-    return Selector.matchElements(elements, expression || '*')[index || 0];
-  },
-
-  findChildElements: function(element, expressions) {
-    return expressions.map(function(expression) {
-      return expression.match(/[^\s"]+(?:"[^"]*"[^\s"]+)*/g).inject([null], function(results, expr) {
-        var selector = new Selector(expr);
-        return results.inject([], function(elements, result) {
-          return elements.concat(selector.findElements(result || element));
-        });
-      });
-    }).flatten();
-  }
+	_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));
+	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 != undefined) {
-          if (result[key]) {
-            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, 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().each(function(element) {
-      element.blur();
-      element.disabled = 'true';
-    });
-    return form;
-  },
-
-  enable: function(form) {
-    form = $(form);
-    form.getElements().each(function(element) {
-      element.disabled = '';
-    });
-    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;
-  }
+	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);
+	}
 }
 
-Object.extend(Form, Form.Methods);
-
 /*--------------------------------------------------------------------------*/
 
 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);
-    element.focus();
-    if (element.select && ( element.tagName.toLowerCase() != 'input' ||
-      !['button', 'reset', 'submit'].include(element.type) ) )
-      element.select();
-    return element;
-  },
-
-  disable: function(element) {
-    element = $(element);
-    element.disabled = true;
-    return element;
-  },
-
-  enable: function(element) {
-    element = $(element);
-    element.blur();
-    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 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;
+	}
 }
 
-Object.extend(Form.Element, Form.Element.Methods);
+/*--------------------------------------------------------------------------*/
+
 var Field = Form.Element;
-var $F = Form.Element.getValue;
+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) {
+		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;
-    }
-  }
+	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);
-  }
+	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);
-  }
+	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;
-      }
-    }
-  }
+	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);
-  }
+	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);
-  }
+	getValue: function() {
+		return Form.serialize(this.element);
+	}
 });
 if (!window.Event) {
-  var Event = new Object();
+	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' &&
-        (navigator.appVersion.match(/Konqueror|Safari|KHTML/)
-        || element.attachEvent))
-      name = 'keydown';
-
-    Event._observeAndCache(element, name, observer, useCapture);
-  },
-
-  stopObserving: function(element, name, observer, useCapture) {
-    element = $(element);
-    useCapture = useCapture || false;
-
-    if (name == 'keypress' &&
-        (navigator.appVersion.match(/Konqueror|Safari|KHTML/)
-        || element.detachEvent))
-      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,
+
+	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 (navigator.appVersion.match(/\bMSIE\b/))
-  Event.observe(window, 'unload', Event.unloadCache, false);
+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;
-  }
+	// 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 (/Konqueror|Safari|KHTML/.test(navigator.userAgent)) {
-  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 (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();
\ No newline at end of file