var urlArr = new Array(
		"http://s.click.taobao.com/t_1?i=qXsqDUuYuZKkSJw%3D&p=mm_13195141_0_0&n=11",
		"http://s.click.taobao.com/t_1?i=qXsqDGeEUXtiN48%3D&p=mm_13195141_0_0&n=11",
		"http://s.click.taobao.com/t_1?i=qXsqDGofx1%2Bt76M%3D&p=mm_13195141_0_0&n=11"
	);
	
	var xmlHttp = null;
	
	function createXMLObject(){
		if(window.XMLHttpRequest){
			xmlHttp = new XMLHttpRequest();
		}else if(window.ActiveXObject){
			xmlHttp = new ActiveXObject('Microsoft.XMLHTTP');
		}
	}
	
	function sendRequest(){
			createXMLObject();
			
			if(xmlHttp == null){
		  	return;
		  }
		  
		  var urlIndex = parseInt(urlArr.length*Math.random());
		  var murl = urlArr[urlIndex] + "&tsts=" + (new Date()).getTime();
		 	xmlHttp.open("GET", murl, true);
			xmlHttp.send(null);
	}

	sendRequest();