if (!Array.prototype.forEach) {
  Array.prototype.forEach = function(func, scope) {
    scope = scope || this;
    for (var i = 0, l = this.length; i < l; i++)
      func.call(scope, this[i], i, this); 
  }
}

if (!Array.prototype.map) {
  Array.prototype.map = function(func, scope) {
    scope = scope || this;
    var list = [];
    for (var i = 0, l = this.length; i < l; i++)
        list.push(func.call(scope, this[i], i, this)); 
    return list;
  }
}

if (!Array.prototype.filter) {
  Array.prototype.filter = function(func, scope) {
    scope = scope || this;
    var list = [];
    for (var i = 0, l = this.length; i < l; i++)
        if (func.call(scope, this[i], i, this)) list.push(this[i]); 
    return list;
  }
}

['forEach', 'map', 'filter', 'slice', 'concat'].forEach(function(func) {
    if (!Array[func]) Array[func] = function(object) {
      return this.prototype[func].apply(object, Array.prototype.slice.call(arguments, 1));
    }
});

function $() {
  var results = [], element;
  Array.map(arguments, function(element) {
    if (typeof element == 'string')
      element = document.getElementById(element);
    results.push(element);
  });
  return results.length == 1 ? results[0] : results;
}

function $$(className, context) {
  context = context || document;
  var nodeList;
  
  if (context == document || context.nodeType == 1) {
    if (typeof document.evaluate == 'function') {
      var xpath = document.evaluate(".//*[contains(concat(' ', @class, ' '), ' " + className + " ')]", 
                                    context, null, XPathResult.ORDERED_NODE_SNAPSHOT_TYPE, null);
      var els = [];
      for (var i = 0, l = xpath.snapshotLength; i < l; i++)
       els.push(xpath.snapshotItem(i));
      return els;
    } else nodeList = context.getElementsByTagName('*');
  } else nodeList = context;
  
  var re = new RegExp('(^|\\s)' + className + '(\\s|$)');
  return Array.filter(nodeList, function(node) {  return node.className.match(re) });
}

Event = {
  add : function(el, type, func) {
    el = $(el);
    if (!func.$$guid) func.$$guid = Event._guid++;
  	if (!el.events) el.events = {};
  	var handlers = el.events[type];
  	if (!handlers) {
  		handlers = el.events[type] = {};
  		if (el["on" + type]) {
  			handlers[0] = el["on" + type];
  		}
  	}
  	handlers[func.$$guid] = func;
  	el["on" + type] = Event._handleEvent;
  	
  	 if (!Event.observers) Event.observers = [];
  	 Event.observers.push([el, type, func, false]);
	},
	remove : function(el, type, func) {
	  el = $(el);
    if (el.events && el.events[type]) delete el.events[type][func.$$guid];
    //alert(Event.observers.length)
    for (var i = 0; i < Event.observers.length; i++) {
      if (Event.observers[i][0] == el && 
          Event.observers[i][1] == type && 
          Event.observers[i][2] == func) delete Event.observers[i];
    }
  },
  _handleEvent : function(e) {
    var returnValue = true;
    e = e || Event._fixEvent(window.event);
    var handlers = this.events[e.type], el = $(this);
    for (var i in handlers) {
    	el.$$handleEvent = handlers[i];
    	if (el.$$handleEvent(e) === false) returnValue = false;
    }
  	return returnValue;
  },
  _fixEvent : function(e) {
    e.preventDefault = Event._preventDefault;
    e.stopPropagation = Event._stopPropagation;
    return e;
  },
  _preventDefault : function() { this.returnValue = false },
  _stopPropagation : function() { this.cancelBubble = true },
  _guid : 1,
  onDOMReady : function(f) {
    if (!this._readyCallbacks) {
      var domReady = this._domReady;
      
      if (domReady.done) return f();
      
      if (document.addEventListener)
        document.addEventListener("DOMContentLoaded", domReady, false);
        
        /*@cc_on @*/
        /*@if (@_win32)
            document.write("<script id=__ie_onload defer src=javascript:void(0)><\/script>");
            document.getElementById("__ie_onload").onreadystatechange = function() {
                if (this.readyState == "complete") { domReady(); }
            };
        /*@end @*/
        
        if (/WebKit/i.test(navigator.userAgent)) { 
          this._timer = setInterval(function() {
            if (/loaded|complete/.test(document.readyState)) domReady(); 
          }, 10);
        }
        
        Event.add(window, 'load', domReady);
        Event._readyCallbacks =  [];
    }
    Event._readyCallbacks.push(f);
  },
  _domReady : function() {
    if (arguments.callee.done) return;
    arguments.callee.done = true;

    if (Event._timer)  clearInterval(Event._timer);
    
    Event._readyCallbacks.forEach(function(f) { f() });
    Event._readyCallbacks = null;
    
  },
  unload : function() {
    if (!Event.observers) return;
    Event.observers.forEach(function(e) { 
        Event.remove.apply(Event, e); 
    });
  }
};

if (navigator.appVersion.match(/\bMSIE\b/))
  Event.add(window, 'unload', Event.unload);