function createAjaxObj()
{
	var xmlhttp;
	try{
		xmlhttp=new ActiveXObject("Msxml2.XMLHTTP");
	}
	catch (e)
	{
		try{
			xmlhttp=new ActiveXObject("Microsoft.XMLHTTP");
			}
		catch (e){
			try{
				xmlhttp=new XMLHttpRequest();
			}
			catch (e)
			{}
		}
	}
	return xmlhttp;
}

function userlogin()
{
	//t1=document.getElementById("time").innerHTML;
	var xmlhttp=createAjaxObj();
	//创建请求，并使用escape对username编码，以避免乱码
	//url="message_check.asp?t1="+t1+ "&t=" +  new Date().getTime();
	url="/script/ajax-login.asp";
	//alert(url);
	xmlhttp.open("get",url);
	xmlhttp.onreadystatechange=function()
	{
		if(4==xmlhttp.readyState)
		{
			if(200==xmlhttp.status)
			{
					str=xmlhttp.responseText;//.replace("上午 ","").replace("下午 ","");
					//a1=str.split("|");	
					document.getElementById("userlogin").innerHTML="<font color='#ff0000'>"+str+"</font>";	
			}
			else
			{
				msg="网络链接失败";
				//alert(msg);
			}
			/*var ch=document.getElementById("s_username");
			ch.innerHTML=""+msg+"";*/	   
		}
	}
	xmlhttp.send(null);  
	return false;
}