function DownStat(){
	var xmlhttp;
	try{
		xmlhttp=new XMLHttpRequest();
	}catch(e){
		xmlhttp=new ActiveXObject("Microsoft.XMLHTTP");
	}
	xmlhttp.onreadystatechange=function(){
		if (4==xmlhttp.readyState){
			if (200==xmlhttp.status){
				var result=xmlhttp.responseText;
				//alert(result);
			}else{
				//alert("error");
			}
		}
	}
	xmlhttp.open("post", "down.asp", true);
	xmlhttp.setRequestHeader('Content-type','application/x-www-form-urlencoded');
	xmlhttp.send("num=1");
}