/*  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();