var Browser = new Object();
Browser.isMozilla = (typeof document.implementation != 'undefined') && (typeof document.implementation.createDocument != 'undefined') && (typeof HTMLDocument!='undefined');
Browser.isIE = window.ActiveXObject ? true : false;
Browser.isFirefox = (navigator.userAgent.toLowerCase().indexOf("firefox")!=-1);
Browser.isOpera = (navigator.userAgent.toLowerCase().indexOf("opera")!=-1);
if (Browser.isFirefox) { // entend Event Mod for FireFox
	extendEventObject();
}
function extendEventObject() {
	Event.prototype.__defineGetter__("srcElement", function () {
		var node = this.target;
		while (node.nodeType != 1) node = node.parentNode;
		return node;
	});

	Event.prototype.__defineGetter__("fromElement", function () {
		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 () {
		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;
	});
}
function IsChild(cNode,pNode){
	while(cNode!=null){
		cNode=cNode.parentNode;
		if(cNode==pNode) return true; 
	}
	return false;
}

var ajccache=new Object();

function getXmlhttp()
{
	var http_request;
	
	if(window.XMLHttpRequest) { 
		http_request = new XMLHttpRequest();
		if (http_request.overrideMimeType) {
			http_request.overrideMimeType("text/xml");
		}
	}
	else if (window.ActiveXObject) { 
		try {
			http_request = new ActiveXObject("Msxml2.XMLHTTP");
		} catch (e) {
			try {
				http_request = new ActiveXObject("Microsoft.XMLHTTP");
			} catch (e) {}
		}
	}
	if (!http_request) { 
		window.alert("can't create XMLHttpRequest object.");
		return null;
	}	
	return http_request;
}
function loadAJAXTab(url,contentid){
	loadAJAXTab(url,contentid,true);
}
function loadAJAXTab(url,contentid,withcache){
	var ocontent=document.getElementById(contentid);
	ocontent.innerHtml="数据载入中……";
	if(ajccache[url]==null) {
		var xhttp=getXmlhttp();		
			xhttp.onreadystatechange=function(){
				if(xhttp.readyState == 4 && (xhttp.status==200 || window.location.href.indexOf("http")==-1))
				{					
					ocontent.innerHTML=xhttp.responseText;
					if (withcache)
						ajccache[url]=ocontent.innerHTML;
					xhttp = null;
				}
			}
		xhttp.open("GET",url,true);
		xhttp.send(null);
	}else{
		ocontent.innerHTML=ajccache[url];
	}
}
//window.onerror=function(){return true;}