var isIE = /msie/i.test(navigator.userAgent);
var isDTD = /CSS1Compat/i.test(document.compatMode);

	
	String.prototype.trim = function(){
		return this.replace(/(^\s*)|(\s*$)/g,"");
	}
	Array.prototype.deleteItem = function(item){
		var i,count = this.length;
		for(i = 0;i < count;i++){
			if(this[i] == item){
				this.splice(i,1);
				i--;
				count--;
			}
		}
	}
	Array.prototype.addItem = function(item){
		for(var i = 0;i < this.length;i++){
			if(this[i] == item)
				return;
		}
		this.push(item);
	}
	Array.prototype.indexOf = function(_value){
		for(var i = 0;i < this.length;i++)
			if(this[i] == _value) return i;
		return -1;
	};
	Array.prototype.lastIndexOf = function(_value){
		for(var i = this.length - 1;i >= 0;i--)
			if(this[i] == _value) return i;
	return -1;
	};
	Array.prototype.contains = function(_value){return this.indexOf(_value)!= -1;};
	if(!isIE){
		window.constructor.prototype.__defineGetter__("event",function(){
			var func = arguments.callee.caller;
			while(func != null){
				var arg0 = func.arguments[0];
				if(arg0 && (arg0.constructor==Event || arg0.constructor ==MouseEvent)){
					return arg0;
				}
				func = func.caller;
			}
	    	return null;
		});
		Event.prototype.__defineSetter__("returnValue",function(b){
			if(!b)this.preventDefault();
			return b;
		});
		Event.prototype.__defineGetter__("srcElement",function(){
			var node=this.target;
			while(node.nodeType != 1)node=node.parentNode;
			return node;
		});
		Event.prototype.__defineGetter__("fromElement",function(){// 返回鼠标移出的源节点
	        var node;
	        if(this.type == "mouseover")
	            node = this.relatedTarget;
	        else if(this.type == "mouseout")
	            node = this.target;
	        if(!node)return;
	        while(node.nodeType != 1)node=node.parentNode;
	        return node;
	        });
	    Event.prototype.__defineGetter__("toElement",function(){// 返回鼠标移入的源节点
	        var node;
	        if(this.type == "mouseout")
	            node = this.relatedTarget;
	        else if(this.type == "mouseover")
	            node = this.target;
	        if(!node)return;
	        while(node.nodeType != 1)node=node.parentNode;
	        return node;
	        });
		Event.prototype.__defineGetter__("offsetX",function(){
				return this.layerX;
		});
		Event.prototype.__defineGetter__("offsetY",function(){
			return this.layerY;
		});
		HTMLElement.prototype.attachEvent = function(sType,foo){
			this.addEventListener(sType.slice(2),foo,false);
		}
		HTMLElement.prototype.detachEvent = function(sType,foo){
			this.removeEventListener(sType.slice(2),foo,false);
		}
		HTMLDocument.prototype.attachEvent = function(sType,foo){
			this.addEventListener(sType.slice(2),foo,false);
		}
		HTMLDocument.prototype.detachEvent = function(sType,foo){
			this.removeEventListener(sType.slice(2),foo,false);
		}
		HTMLElement.prototype.__defineGetter__("innerText",function(){
			return this.textContent;
		});
		HTMLElement.prototype.__defineSetter__("innerText",function(str){
			this.textContent = str;
		});
		HTMLElement.prototype.insertAdjacentElement = function(where,parsedNode){
			switch(where){
				case "beforeBegin":
	                this.parentNode.insertBefore(parsedNode,this);
	                break;
	            case "afterBegin":
	                this.insertBefore(parsedNode,this.firstChild);
	                break;
	            case "beforeEnd":
	                this.appendChild(parsedNode);
	                break;
	            case "afterEnd":
	                if(this.nextSibling)
	                    this.parentNode.insertBefore(parsedNode,this.nextSibling);
	                else
	                    this.parentNode.appendChild(parsedNode);
	                break;
			}
		}
	    HTMLElement.prototype.insertAdjacentHTML = function(where,htmlStr){
	        var r = this.ownerDocument.createRange();
	        r.setStartBefore(this);
	        var parsedHTML = r.createContextualFragment(htmlStr);
	        this.insertAdjacentElement(where,parsedHTML);
		}
		HTMLElement.prototype.contains = function(Node){// 是否包含某节点
	        do if(Node == this)return true;
	        while(Node = Node.parentNode);
	        return false;
	        }
	}
	else document.execCommand("BackgroundImageCache",false,true);

function $(id){return (typeof id == "string" ? document.getElementById(id) : id);}
function $N(name){return document.getElementsByName(name);}
function $TN(name,root){return root ? $(root).getElementsByTagName(name) : document.getElementsByTagName(name);}
function $F(id){return exist(id) ? $(id).value.trim() : null;}
function $IH(id,s){$(id).innerHTML = s;}
function $IT(id,s){$(id).innerText = s;}
function $iF(id,s){$(id).value = s;}
function $DC(name){return document.createElement(name);}
function isEmpty(str){return str.replace(/(?:null)|(?:undefined)/i,"").length == 0;}
function exist(id){return $(id)!= null;}
function hide(){
	for(var i = 0; i < arguments.length; i++){
		if(exist(arguments[i])){
			if($(arguments[i]).style.visibility) $(arguments[i]).style.visibility = "hidden";
			else $(arguments[i]).style.display = "none";
		}
	}
}
function show(){
	for(var i = 0; i < arguments.length; i++){
		if(exist(arguments[i])){
			if($(arguments[i]).style.visibility) $(arguments[i]).style.visibility="visible";
			else $(arguments[i]).style.display = "";
		}
	}
}
function $previousSibling(id){
	return (($(id).previousSibling.nodeName == "#text" && !/^\S$/g.test($(id).previousSibling.nodeValue)) ? $(id).previousSibling.previousSibling : $(id).previousSibling);
}
function $nextSibling(id){
	return (($(id).nextSibling.nodeName == "#text" && !/^\S$/g.test($(id).nextSibling.nodeValue)) ? $(id).nextSibling.nextSibling : $(id).nextSibling);
}
function $removeNode(id){
	if(exist(id)){
		$(id).parentNode.removeChild($(id));
	}
}

function in_array(value, array) {
	if(typeof value == 'string') {
		for(var i in array) {
			if(array[i] == value) {
				return true;
			}
		}
	}
	return false;
}