function XMLRequst(purl,method,asy){
	if(typeof method =='undefined') method = 'get';	
	if(typeof asy =='undefined') asy = true;	
	
	this.http_request = false;
	this.url=purl;
	this.createXMLRequst = function(){
			//开始初始化XMLHttpRequest对象
		if(window.XMLHttpRequest) { //Mozilla 浏览器
			this.http_request = new XMLHttpRequest();
			if (this.http_request.overrideMimeType) {//设置MiME类别
				this.http_request.overrideMimeType("text/xml");
			}
		}
		else if (window.ActiveXObject) { // IE浏览器
			try {
				this.http_request = new ActiveXObject("Msxml2.XMLHTTP");
			} catch (e) {
				try {				
					this.http_request = new ActiveXObject("Microsoft.XMLHTTP");
				} catch (e) {}
			}
		}
		if(!this.http_request) { // 异常，创建对象实例失败
			throw new Error("不能创建XMLHttpRequest对象实例.");
			return null;
		}
		this.http_request.open(method,this.url,asy);
		return this.http_request;
	}
}

function showcata(id,url){
	var request = new XMLRequst(url).createXMLRequst();

	request.onreadystatechange = function(){
		if (request.readyState == 4){
			if (request.status == 200){
				var oDiv = document.getElementById(id);
				oDiv.innerHTML = request.responseText;
				$("ul.assort ul li").not(":has(ul)").css("backgroundImage", "none");
			} else { 
			}
		}
	};
	
	request.send(null);
}