/*  Prototype JavaScript framework, version 1.5.0
  *  (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/
  *
 /*--------------------------------------------------------------------------*/
 
 var Prototype = {
   Version: '1.5.0',
   BrowserFeatures: {
     XPath: !!document.evaluate
   },
 
   ScriptFragment: '(?:<script.*?>)((\n|\r|.)*?)(?:<\/script>)',
   emptyFunction: function() {},
   K: function(x) { return x }
 }
 
 var Class = {
   create: function() {
     return function() {
       this.initialize.apply(this, arguments);
     }
   }
 }
 
 var Abstract = new Object();
 
 Object.extend = function(destination, source) {
   for (var property in source) {
     destination[property] = source[property];
   }
   return destination;
 }
 
 Object.extend(Object, {
   inspect: function(object) {
     try {
       if (object === undefined) return 'undefined';
       if (object === null) return 'null';
       return object.inspect ? object.inspect() : object.toString();
     } catch (e) {
       if (e instanceof RangeError) return '...';
       throw e;
     }
   },
 
   keys: function(object) {
     var keys = [];
     for (var property in object)
       keys.push(property);
     return keys;
   },
 
   values: function(object) {
     var values = [];
     for (var property in object)
       values.push(object[property]);
     return values;
   },
 
   clone: function(object) {
     return Object.extend({}, object);
   }
 });
 
 Function.prototype.bind = function() {
   var __method = this, args = $A(arguments), object = args.shift();
   return function() {
     return __method.apply(object, args.concat($A(arguments)));
   }
 }
 
 Function.prototype.bindAsEventListener = function(object) {
   var __method = this, args = $A(arguments), object = args.shift();
   return function(event) {
     return __method.apply(object, [( event || window.event)].concat(args).concat($A(arguments)));
   }
 }
 
 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;
   }
 });
 
 var Try = {
   these: function() {
     var returnValue;
 
     for (var i = 0, length = arguments.length; i < length; i++) {
       var lambda = arguments[i];
       try {
         returnValue = lambda();
         break;
       } catch (e) {}
     }
 
     return returnValue;
   }
 }
 
 /*--------------------------------------------------------------------------*/
 
 var PeriodicalExecuter = Class.create();
 PeriodicalExecuter.prototype = {
   initialize: function(callback, frequency) {
     this.callback = callback;
     this.frequency = frequency;
     this.currentlyExecuting = false;
 
     this.registerCallback();
   },
 
   registerCallback: function() {
     this.timer = setInterval(this.onTimerEvent.bind(this), this.frequency * 1000);
   },
 
   stop: function() {
     if (!this.timer) return;
     clearInterval(this.timer);
     this.timer = null;
   },
 
   onTimerEvent: function() {
     if (!this.currentlyExecuting) {
       try {
         this.currentlyExecuting = true;
         this.callback(this);
       } finally {
         this.currentlyExecuting = false;
       }
     }
   }
 }
 String.interpret = function(value){
   return value == null ? '' : String(value);
 }
 
 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, '\\\'') + "'";
   }
 });
 
 String.prototype.gsub.prepareReplacement = function(replacement) {
   if (typeof replacement == 'function') return replacement;
   var template = new Template(replacement);
   return function(match) { return template.evaluate(match) };
 }
 
 String.prototype.parseQuery = String.prototype.toQueryParams;
 
 var Template = Class.create();
 Template.Pattern = /(^|.|\r|\n)(#\{(.*?)\})/;
 Template.prototype = {
   initialize: function(template, pattern) {
     this.template = template.toString();
     this.pattern  = pattern || Template.Pattern;
   },
 
   evaluate: function(object) {
     return this.template.gsub(this.pattern, function(match) {
       var before = match[1];
       if (before == '\\') return match[2];
       return before + String.interpret(object[match[3]]);
     });
   }
 }
 
 var $break    = new Object();
 var $continue = new Object();
 
 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() + '>';
   }
 }
 
 Object.extend(Enumerable, {
   map:     Enumerable.collect,
   find:    Enumerable.detect,
   select:  Enumerable.findAll,
   member:  Enumerable.include,
   entries: Enumerable.toArray
 });
 var $A = Array.from = function(iterable) {
   if (!iterable) return [];
   if (iterable.toArray) {
     return iterable.toArray();
   } else {
     var results = [];
     for (var i = 0, length = iterable.length; i < length; i++)
       results.push(iterable[i]);
     return results;
   }
 }
 
 Object.extend(Array.prototype, Enumerable);
 
 if (!Array.prototype._reverse)
   Array.prototype._reverse = Array.prototype.reverse;
 
 Object.extend(Array.prototype, {
   _each: function(iterator) {
     for (var i = 0, length = this.length; i < length; i++)
       iterator(this[i]);
   },
 
   clear: function() {
     this.length = 0;
     return this;
   },
 
   first: function() {
     return this[0];
   },
 
   last: function() {
     return this[this.length - 1];
   },
 
   compact: function() {
     return this.select(function(value) {
       return value != null;
     });
   },
 
   flatten: function() {
     return this.inject([], function(array, value) {
       return array.concat(value && value.constructor == Array ?
         value.flatten() : [value]);
     });
   },
 
   without: function() {
     var values = $A(arguments);
     return this.select(function(value) {
       return !values.include(value);
     });
   },
 
   indexOf: function(object) {
     for (var i = 0, length = this.length; i < length; i++)
       if (this[i] == object) return i;
     return -1;
   },
 
   reverse: function(inline) {
     return (inline !== false ? this : this.toArray())._reverse();
   },
 
   reduce: function() {
     return this.length > 1 ? this : this[0];
   },
 
   uniq: function() {
     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(', ') + ']';
   }
 });
 
 Array.prototype.toArray = Array.prototype.clone;
 
 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;
   }
 }
 var Hash = function(obj) {
   Object.extend(this, obj || {});
 };
 
 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('&');
   }
 });
 
 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(', ') + '}>';
   }
 });
 
 function $H(object) {
   if (object && object.constructor == Hash) return object;
   return new Hash(object);
 };
 ObjectRange = Class.create();
 Object.extend(ObjectRange.prototype, Enumerable);
 Object.extend(ObjectRange.prototype, {
   initialize: function(start, end, exclusive) {
     this.start = start;
     this.end = end;
     this.exclusive = exclusive;
   },
 
   _each: function(iterator) {
     var value = this.start;
     while (this.include(value)) {
       iterator(value);
       value = value.succ();
     }
   },
 
   include: function(value) {
     if (value < this.start)
       return false;
     if (this.exclusive)
       return value < this.end;
     return value <= this.end;
   }
 });
 
 var $R = function(start, end, exclusive) {
   return new ObjectRange(start, end, exclusive);
 }
 
 var Ajax = {
   getTransport: function() {
     return Try.these(
       function() {return new XMLHttpRequest()},
       function() {return new ActiveXObject('Msxml2.XMLHTTP')},
       function() {return new ActiveXObject('Microsoft.XMLHTTP')}
     ) || false;
   },
 
   activeRequestCount: 0
 }
 
 Ajax.Responders = {
   responders: [],
 
   _each: function(iterator) {
     this.responders._each(iterator);
   },
 
   register: function(responder) {
     if (!this.include(responder))
       this.responders.push(responder);
   },
 
   unregister: function(responder) {
     this.responders = this.responders.without(responder);
   },
 
   dispatch: function(callback, request, transport, json) {
     this.each(function(responder) {
       if (typeof responder[callback] == 'function') {
         try {
           responder[callback].apply(responder, [request, transport, json]);
         } catch (e) {}
       }
     });
   }
 };
 
 Object.extend(Ajax.Responders, Enumerable);
 
 Ajax.Responders.register({
   onCreate: function() {
     Ajax.activeRequestCount++;
   },
   onComplete: function() {
     Ajax.activeRequestCount--;
   }
 });
 
 Ajax.Base = function() {};
 Ajax.Base.prototype = {
   setOptions: function(options) {
     this.options = {
       method:       'post',
       asynchronous: true,
       contentType:  'application/x-www-form-urlencoded',
       encoding:     'UTF-8',
       parameters:   ''
     }
     Object.extend(this.options, options || {});
 
     this.options.method = this.options.method.toLowerCase();
     if (typeof this.options.parameters == 'string')
       this.options.parameters = this.options.parameters.toQueryParams();
   }
 }
 
 Ajax.Request = Class.create();
 Ajax.Request.Events =
   ['Uninitialized', 'Loading', 'Loaded', 'Interactive', 'Complete'];
 
 Ajax.Request.prototype = Object.extend(new Ajax.Base(), {
   _complete: false,
 
   initialize: function(url, options) {
     this.transport = Ajax.getTransport();
     this.setOptions(options);
     this.request(url);
   },
 
   request: function(url) {
     this.url = url;
     this.method = this.options.method;
     var params = 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);
   }
 });
 
 Ajax.Updater = Class.create();
 
 Object.extend(Object.extend(Ajax.Updater.prototype, Ajax.Request.prototype), {
   initialize: function(container, url, options) {
     this.container = {
       success: (container.success || container),
       failure: (container.failure || (container.success ? null : container))
     }
 
     this.transport = Ajax.getTransport();
     this.setOptions(options);
 
     var onComplete = this.options.onComplete || Prototype.emptyFunction;
     this.options.onComplete = (function(transport, param) {
       this.updateContent();
       onComplete(transport, param);
     }).bind(this);
 
     this.request(url);
   },
 
   updateContent: function() {
     var receiver = this.container[this.success() ? 'success' : 'failure'];
     var response = this.transport.responseText;
 
     if (!this.options.evalScripts) response = response.stripScripts();
 
     if (receiver = $(receiver)) {
       if (this.options.insertion)
         new this.options.insertion(receiver, response);
       else
         receiver.update(response);
     }
 
     if (this.success()) {
       if (this.onComplete)
         setTimeout(this.onComplete.bind(this), 10);
     }
   }
 });
 
 Ajax.PeriodicalUpdater = Class.create();
 Ajax.PeriodicalUpdater.prototype = Object.extend(new Ajax.Base(), {
   initialize: function(container, url, options) {
     this.setOptions(options);
     this.onComplete = this.options.onComplete;
 
     this.frequency = (this.options.frequency || 2);
     this.decay = (this.options.decay || 1);
 
     this.updater = {};
     this.container = container;
     this.url = url;
 
     this.start();
   },
 
   start: function() {
     this.options.onComplete = this.updateComplete.bind(this);
     this.onTimerEvent();
   },
 
   stop: function() {
     this.updater.options.onComplete = undefined;
     clearTimeout(this.timer);
     (this.onComplete || Prototype.emptyFunction).apply(this, arguments);
   },
 
   updateComplete: function(request) {
     if (this.options.decay) {
       this.decay = (request.responseText == this.lastText ?
         this.decay * this.options.decay : 1);
 
       this.lastText = request.responseText;
     }
     this.timer = setTimeout(this.onTimerEvent.bind(this),
       this.decay * this.frequency * 1000);
   },
 
   onTimerEvent: function() {
     this.updater = new Ajax.Updater(this.container, this.url, this.options);
   }
 });
 function $(element) {
   if (arguments.length > 1) {
     for (var i = 0, elements = [], length = arguments.length; i < length; i++)
       elements.push($(arguments[i]));
     return elements;
   }
   if (typeof element == 'string')
     element = document.getElementById(element);
   return Element.extend(element);
 }
 
 if (Prototype.BrowserFeatures.XPath) {
   document._getElementsByXPath = function(expression, parentElement) {
     var results = [];
     var query = document.evaluate(expression, $(parentElement) || document,
       null, XPathResult.ORDERED_NODE_SNAPSHOT_TYPE, null);
     for (var i = 0, length = query.snapshotLength; i < length; i++)
       results.push(query.snapshotItem(i));
     return results;
   };
 }
 
 document.getElementsByClassName = function(className, parentElement) {
   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;
   }
 };
 
 /*--------------------------------------------------------------------------*/
 
 if (!window.Element)
   var Element = new Object();
 
 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;
 };
 
 Element.extend.cache = {
   findOrStore: function(value) {
     return this[value] = this[value] || function() {
       return value.apply(null, [this].concat($A(arguments)));
     }
   }
 };
 
 Element.Methods = {
   visible: function(element) {
     return $(element).style.display != 'none';
   },
 
   toggle: function(element) {
     element = $(element);
     Element[Element.visible(element) ? 'hide' : 'show'](element);
     return element;
   },
 
   hide: function(element) {
     $(element).style.display = 'none';
     return element;
   },
 
   show: function(element) {
     $(element).style.display = '';
     return element;
   },
 
   remove: function(element) {
     element = $(element);
     element.parentNode.removeChild(element);
     return element;
   },
 
   update: function(element, html) {
     html = typeof html == 'undefined' ? '' : html.toString();
     $(element).innerHTML = html.stripScripts();
     setTimeout(function() {html.evalScripts()}, 10);
     return element;
   },
 
   replace: function(element, html) {
     element = $(element);
     html = typeof html == 'undefined' ? '' : html.toString();
     if (element.outerHTML) {
       element.outerHTML = html.stripScripts();
     } else {
       var range = element.ownerDocument.createRange();
       range.selectNodeContents(element);
       element.parentNode.replaceChild(
         range.createContextualFragment(html.stripScripts()), element);
     }
     setTimeout(function() {html.evalScripts()}, 10);
     return element;
   },
 
   inspect: function(element) {
     element = $(element);
     var result = '<' + element.tagName.toLowerCase();
     $H({'id': 'id', 'className': 'class'}).each(function(pair) {
       var property = pair.first(), attribute = pair.last();
       var value = (element[property] || '').toString();
       if (value) result += ' ' + attribute + '=' + value.inspect(true);
     });
     return result + '>';
   },
 
   recursivelyCollect: function(element, property) {
     element = $(element);
     var elements = [];
     while (element = element[property])
       if (element.nodeType == 1)
         elements.push(Element.extend(element));
     return elements;
   },
 
   ancestors: function(element) {
     return $(element).recursivelyCollect('parentNode');
   },
 
   descendants: function(element) {
     return $A($(element).getElementsByTagName('*'));
   },
 
   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"
 };
 
 Element._attributeTranslations.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
 });
 
 Element.Methods.Simulated = {
   hasAttribute: function(element, attribute) {
     var t = Element._attributeTranslations;
     attribute = t.names[attribute] || attribute;
     return $(element).getAttributeNode(attribute).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;
   }
 };
 
 Object.extend(Element, Element.Methods);
 
 var _nativeExtensions = false;
 
 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.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 Toggle = new Object();
 Toggle.display = Element.toggle;
 
 /*--------------------------------------------------------------------------*/
 
 Abstract.Insertion = function(adjacency) {
   this.adjacency = adjacency;
 }
 
 Abstract.Insertion.prototype = {
   initialize: function(element, content) {
     this.element = $(element);
     this.content = content.stripScripts();
 
     if (this.adjacency && this.element.insertAdjacentHTML) {
       try {
         this.element.insertAdjacentHTML(this.adjacency, this.content);
       } catch (e) {
         var tagName = this.element.tagName.toUpperCase();
         if (['TBODY', 'TR'].include(tagName)) {
           this.insertContent(this.contentFromAnonymousTable());
         } else {
           throw e;
         }
       }
     } else {
       this.range = this.element.ownerDocument.createRange();
       if (this.initializeRange) this.initializeRange();
       this.insertContent([this.range.createContextualFragment(this.content)]);
     }
 
     setTimeout(function() {content.evalScripts()}, 10);
   },
 
   contentFromAnonymousTable: function() {
     var div = document.createElement('div');
     div.innerHTML = '<table><tbody>' + this.content + '</tbody></table>';
     return $A(div.childNodes[0].childNodes[0].childNodes);
   }
 }
 
 var Insertion = new Object();
 
 Insertion.Before = Class.create();
 Insertion.Before.prototype = Object.extend(new Abstract.Insertion('beforeBegin'), {
   initializeRange: function() {
     this.range.setStartBefore(this.element);
   },
 
   insertContent: function(fragments) {
     fragments.each((function(fragment) {
       this.element.parentNode.insertBefore(fragment, this.element);
     }).bind(this));
   }
 });
 
 Insertion.Top = Class.create();
 Insertion.Top.prototype = Object.extend(new Abstract.Insertion('afterBegin'), {
   initializeRange: function() {
     this.range.selectNodeContents(this.element);
     this.range.collapse(true);
   },
 
   insertContent: function(fragments) {
     fragments.reverse(false).each((function(fragment) {
       this.element.insertBefore(fragment, this.element.firstChild);
     }).bind(this));
   }
 });
 
 Insertion.Bottom = Class.create();
 Insertion.Bottom.prototype = Object.extend(new Abstract.Insertion('beforeEnd'), {
   initializeRange: function() {
     this.range.selectNodeContents(this.element);
     this.range.collapse(this.element);
   },
 
   insertContent: function(fragments) {
     fragments.each((function(fragment) {
       this.element.appendChild(fragment);
     }).bind(this));
   }
 });
 
 Insertion.After = Class.create();
 Insertion.After.prototype = Object.extend(new Abstract.Insertion('afterEnd'), {
   initializeRange: function() {
     this.range.setStartAfter(this.element);
   },
 
   insertContent: function(fragments) {
     fragments.each((function(fragment) {
       this.element.parentNode.insertBefore(fragment,
         this.element.nextSibling);
     }).bind(this));
   }
 });
 
 /*--------------------------------------------------------------------------*/
 
 Element.ClassNames = Class.create();
 Element.ClassNames.prototype = {
   initialize: function(element) {
     this.element = $(element);
   },
 
   _each: function(iterator) {
     this.element.className.split(/\s+/).select(function(name) {
       return name.length > 0;
     })._each(iterator);
   },
 
   set: function(className) {
     this.element.className = className;
   },
 
   add: function(classNameToAdd) {
     if (this.include(classNameToAdd)) return;
     this.set($A(this).concat(classNameToAdd).join(' '));
   },
 
   remove: function(classNameToRemove) {
     if (!this.include(classNameToRemove)) return;
     this.set($A(this).without(classNameToRemove).join(' '));
   },
 
   toString: function() {
     return $A(this).join(' ');
   }
 };
 
 Object.extend(Element.ClassNames.prototype, Enumerable);
 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;
   }
 }
 
 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();
   }
 });
 
 function $$() {
   return Selector.findChildElements(document, $A(arguments));
 }
 var Form = {
   reset: function(form) {
     $(form).reset();
     return form;
   },
 
   serializeElements: function(elements, getHash) {
     var data = elements.inject({}, function(result, element) {
       if (!element.disabled && element.name) {
         var key = element.name, value = $(element).getValue();
         if (value != 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);
   }
 };
 
 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;
   }
 }
 
 Object.extend(Form, Form.Methods);
 
 /*--------------------------------------------------------------------------*/
 
 Form.Element = {
   focus: function(element) {
     $(element).focus();
     return element;
   },
 
   select: function(element) {
     $(element).select();
     return element;
   }
 }
 
 Form.Element.Methods = {
   serialize: function(element) {
     element = $(element);
     if (!element.disabled && element.name) {
       var value = element.getValue();
       if (value != undefined) {
         var pair = {};
         pair[element.name] = value;
         return Hash.toQueryString(pair);
       }
     }
     return '';
   },
 
   getValue: function(element) {
     element = $(element);
     var method = element.tagName.toLowerCase();
     return Form.Element.Serializers[method](element);
   },
 
   clear: function(element) {
     $(element).value = '';
     return element;
   },
 
   present: function(element) {
     return $(element).value != '';
   },
 
   activate: function(element) {
     element = $(element);
     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;
   }
 }
 
 Object.extend(Form.Element, Form.Element.Methods);
 var Field = Form.Element;
 var $F = Form.Element.getValue;
 
 /*--------------------------------------------------------------------------*/
 
 Form.Element.Serializers = {
   input: function(element) {
     switch (element.type.toLowerCase()) {
       case 'checkbox':
       case 'radio':
         return Form.Element.Serializers.inputSelector(element);
       default:
         return Form.Element.Serializers.textarea(element);
     }
   },
 
   inputSelector: function(element) {
     return element.checked ? element.value : null;
   },
 
   textarea: function(element) {
     return element.value;
   },
 
   select: function(element) {
     return this[element.type == 'select-one' ?
       'selectOne' : 'selectMany'](element);
   },
 
   selectOne: function(element) {
     var index = element.selectedIndex;
     return index >= 0 ? this.optionValue(element.options[index]) : null;
   },
 
   selectMany: function(element) {
     var values, length = element.length;
     if (!length) return null;
 
     for (var i = 0, values = []; i < length; i++) {
       var opt = element.options[i];
       if (opt.selected) values.push(this.optionValue(opt));
     }
     return values;
   },
 
   optionValue: function(opt) {
     // extend element because hasAttribute may not be native
     return Element.extend(opt).hasAttribute('value') ? opt.value : opt.text;
   }
 }
 
 /*--------------------------------------------------------------------------*/
 
 Abstract.TimedObserver = function() {}
 Abstract.TimedObserver.prototype = {
   initialize: function(element, frequency, callback) {
     this.frequency = frequency;
     this.element   = $(element);
     this.callback  = callback;
 
     this.lastValue = this.getValue();
     this.registerCallback();
   },
 
   registerCallback: function() {
     setInterval(this.onTimerEvent.bind(this), this.frequency * 1000);
   },
 
   onTimerEvent: function() {
     var value = this.getValue();
     var changed = ('string' == typeof this.lastValue && 'string' == typeof value
       ? this.lastValue != value : String(this.lastValue) != String(value));
     if (changed) {
       this.callback(this.element, value);
       this.lastValue = value;
     }
   }
 }
 
 Form.Element.Observer = Class.create();
 Form.Element.Observer.prototype = Object.extend(new Abstract.TimedObserver(), {
   getValue: function() {
     return Form.Element.getValue(this.element);
   }
 });
 
 Form.Observer = Class.create();
 Form.Observer.prototype = Object.extend(new Abstract.TimedObserver(), {
   getValue: function() {
     return Form.serialize(this.element);
   }
 });
 
 /*--------------------------------------------------------------------------*/
 
 Abstract.EventObserver = function() {}
 Abstract.EventObserver.prototype = {
   initialize: function(element, callback) {
     this.element  = $(element);
     this.callback = callback;
 
     this.lastValue = this.getValue();
     if (this.element.tagName.toLowerCase() == 'form')
       this.registerFormCallbacks();
     else
       this.registerCallback(this.element);
   },
 
   onElementEvent: function() {
     var value = this.getValue();
     if (this.lastValue != value) {
       this.callback(this.element, value);
       this.lastValue = value;
     }
   },
 
   registerFormCallbacks: function() {
     Form.getElements(this.element).each(this.registerCallback.bind(this));
   },
 
   registerCallback: function(element) {
     if (element.type) {
       switch (element.type.toLowerCase()) {
         case 'checkbox':
         case 'radio':
           Event.observe(element, 'click', this.onElementEvent.bind(this));
           break;
         default:
           Event.observe(element, 'change', this.onElementEvent.bind(this));
           break;
       }
     }
   }
 }
 
 Form.Element.EventObserver = Class.create();
 Form.Element.EventObserver.prototype = Object.extend(new Abstract.EventObserver(), {
   getValue: function() {
     return Form.Element.getValue(this.element);
   }
 });
 
 Form.EventObserver = Class.create();
 Form.EventObserver.prototype = Object.extend(new Abstract.EventObserver(), {
   getValue: function() {
     return Form.serialize(this.element);
   }
 });
 if (!window.Event) {
   var Event = new Object();
 }
 
 Object.extend(Event, {
   KEY_BACKSPACE: 8,
   KEY_TAB:       9,
   KEY_RETURN:   13,
   KEY_ESC:      27,
   KEY_LEFT:     37,
   KEY_UP:       38,
   KEY_RIGHT:    39,
   KEY_DOWN:     40,
   KEY_DELETE:   46,
   KEY_HOME:     36,
   KEY_END:      35,
   KEY_PAGEUP:   33,
   KEY_PAGEDOWN: 34,
 
   element: function(event) {
     return event.target || event.srcElement;
   },
 
   isLeftClick: function(event) {
     return (((event.which) && (event.which == 1)) ||
             ((event.button) && (event.button == 1)));
   },
 
   pointerX: function(event) {
     return event.pageX || (event.clientX +
       (document.documentElement.scrollLeft || document.body.scrollLeft));
   },
 
   pointerY: function(event) {
     return event.pageY || (event.clientY +
       (document.documentElement.scrollTop || document.body.scrollTop));
   },
 
   stop: function(event) {
     if (event.preventDefault) {
       event.preventDefault();
       event.stopPropagation();
     } else {
       event.returnValue = false;
       event.cancelBubble = true;
     }
   },
 
   // find the first node with the given tagName, starting from the
   // node the event was triggered on; traverses the DOM upwards
   findElement: function(event, tagName) {
     var element = Event.element(event);
     while (element.parentNode && (!element.tagName ||
         (element.tagName.toUpperCase() != tagName.toUpperCase())))
       element = element.parentNode;
     return element;
   },
 
   observers: false,
 
   _observeAndCache: function(element, name, observer, useCapture) {
     if (!this.observers) this.observers = [];
     if (element.addEventListener) {
       this.observers.push([element, name, observer, useCapture]);
       element.addEventListener(name, observer, useCapture);
     } else if (element.attachEvent) {
       this.observers.push([element, name, observer, useCapture]);
       element.attachEvent('on' + name, observer);
     }
   },
 
   unloadCache: function() {
     if (!Event.observers) return;
     for (var i = 0, length = Event.observers.length; i < length; i++) {
       Event.stopObserving.apply(this, Event.observers[i]);
       Event.observers[i][0] = null;
     }
     Event.observers = false;
   },
 
   observe: function(element, name, observer, useCapture) {
     element = $(element);
     useCapture = useCapture || false;
 
     if (name == 'keypress' &&
         (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) {}
     }
   }
 });
 
 /* prevent memory leaks in IE */
 if (navigator.appVersion.match(/\bMSIE\b/))
   Event.observe(window, 'unload', Event.unloadCache, false);
 var Position = {
   // set to true if needed, warning: firefox performance problems
   // NOT neeeded for page scrolling, only if draggable contained in
   // scrollable elements
   includeScrollOffsets: false,
 
   // must be called before calling withinIncludingScrolloffset, every time the
   // page is scrolled
   prepare: function() {
     this.deltaX =  window.pageXOffset
                 || document.documentElement.scrollLeft
                 || document.body.scrollLeft
                 || 0;
     this.deltaY =  window.pageYOffset
                 || document.documentElement.scrollTop
                 || document.body.scrollTop
                 || 0;
   },
 
   realOffset: function(element) {
     var valueT = 0, valueL = 0;
     do {
       valueT += element.scrollTop  || 0;
       valueL += element.scrollLeft || 0;
       element = element.parentNode;
     } while (element);
     return [valueL, valueT];
   },
 
   cumulativeOffset: function(element) {
     var valueT = 0, valueL = 0;
     do {
       valueT += element.offsetTop  || 0;
       valueL += element.offsetLeft || 0;
       element = element.offsetParent;
     } while (element);
     return [valueL, valueT];
   },
 
   positionedOffset: function(element) {
     var valueT = 0, valueL = 0;
     do {
       valueT += element.offsetTop  || 0;
       valueL += element.offsetLeft || 0;
       element = element.offsetParent;
       if (element) {
         if(element.tagName=='BODY') break;
         var p = Element.getStyle(element, 'position');
         if (p == 'relative' || p == 'absolute') break;
       }
     } while (element);
     return [valueL, valueT];
   },
 
   offsetParent: function(element) {
     if (element.offsetParent) return element.offsetParent;
     if (element == document.body) return element;
 
     while ((element = element.parentNode) && element != document.body)
       if (Element.getStyle(element, 'position') != 'static')
         return element;
 
     return document.body;
   },
 
   // caches x/y coordinate pair to use with overlap
   within: function(element, x, y) {
     if (this.includeScrollOffsets)
       return this.withinIncludingScrolloffsets(element, x, y);
     this.xcomp = x;
     this.ycomp = y;
     this.offset = this.cumulativeOffset(element);
 
     return (y >= this.offset[1] &&
             y <  this.offset[1] + element.offsetHeight &&
             x >= this.offset[0] &&
             x <  this.offset[0] + element.offsetWidth);
   },
 
   withinIncludingScrolloffsets: function(element, x, y) {
     var offsetcache = this.realOffset(element);
 
     this.xcomp = x + offsetcache[0] - this.deltaX;
     this.ycomp = y + offsetcache[1] - this.deltaY;
     this.offset = this.cumulativeOffset(element);
 
     return (this.ycomp >= this.offset[1] &&
             this.ycomp <  this.offset[1] + element.offsetHeight &&
             this.xcomp >= this.offset[0] &&
             this.xcomp <  this.offset[0] + element.offsetWidth);
   },
 
   // within must be called directly before
   overlap: function(mode, element) {
     if (!mode) return 0;
     if (mode == 'vertical')
       return ((this.offset[1] + element.offsetHeight) - this.ycomp) /
         element.offsetHeight;
     if (mode == 'horizontal')
       return ((this.offset[0] + element.offsetWidth) - this.xcomp) /
         element.offsetWidth;
   },
 
   page: function(forElement) {
     var valueT = 0, valueL = 0;
 
     var element = forElement;
     do {
       valueT += element.offsetTop  || 0;
       valueL += element.offsetLeft || 0;
 
       // Safari fix
       if (element.offsetParent==document.body)
         if (Element.getStyle(element,'position')=='absolute') break;
 
     } while (element = element.offsetParent);
 
     element = forElement;
     do {
       if (!window.opera || element.tagName=='BODY') {
         valueT -= element.scrollTop  || 0;
         valueL -= element.scrollLeft || 0;
       }
     } while (element = element.parentNode);
 
     return [valueL, valueT];
   },
 
   clone: function(source, target) {
     var options = Object.extend({
       setLeft:    true,
       setTop:     true,
       setWidth:   true,
       setHeight:  true,
       offsetTop:  0,
       offsetLeft: 0
     }, arguments[2] || {})
 
     // find page position of source
     source = $(source);
     var p = Position.page(source);
 
     // find coordinate system to use
     target = $(target);
     var delta = [0, 0];
     var parent = null;
     // delta [0,0] will do fine with position: fixed elements,
     // position:absolute needs offsetParent deltas
     if (Element.getStyle(target,'position') == 'absolute') {
       parent = Position.offsetParent(target);
       delta = Position.page(parent);
     }
 
     // correct by body offsets (fixes Safari)
     if (parent == document.body) {
       delta[0] -= document.body.offsetLeft;
       delta[1] -= document.body.offsetTop;
     }
 
     // set position
     if(options.setLeft)   target.style.left  = (p[0] - delta[0] + options.offsetLeft) + 'px';
     if(options.setTop)    target.style.top   = (p[1] - delta[1] + options.offsetTop) + 'px';
     if(options.setWidth)  target.style.width = source.offsetWidth + 'px';
     if(options.setHeight) target.style.height = source.offsetHeight + 'px';
   },
 
   absolutize: function(element) {
     element = $(element);
     if (element.style.position == 'absolute') return;
     Position.prepare();
 
     var offsets = Position.positionedOffset(element);
     var top     = offsets[1];
     var left    = offsets[0];
     var width   = element.clientWidth;
     var height  = element.clientHeight;
 
     element._originalLeft   = left - parseFloat(element.style.left  || 0);
     element._originalTop    = top  - parseFloat(element.style.top || 0);
     element._originalWidth  = element.style.width;
     element._originalHeight = element.style.height;
 
     element.style.position = 'absolute';
     element.style.top    = top + 'px';
     element.style.left   = left + 'px';
     element.style.width  = width + 'px';
     element.style.height = height + 'px';
   },
 
   relativize: function(element) {
     element = $(element);
     if (element.style.position == 'relative') return;
     Position.prepare();
 
     element.style.position = 'relative';
     var top  = parseFloat(element.style.top  || 0) - (element._originalTop || 0);
     var left = parseFloat(element.style.left || 0) - (element._originalLeft || 0);
 
     element.style.top    = top + 'px';
     element.style.left   = left + 'px';
     element.style.height = element._originalHeight;
     element.style.width  = element._originalWidth;
   }
 }
 
 // Safari returns margins on body which is incorrect if the child is absolutely
 // positioned.  For performance reasons, redefine Position.cumulativeOffset for
 // KHTML/WebKit only.
 if (/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];
   }
 }
 
 Element.addMethods();