function SendAjax(Url,BodyID)
{
	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 Bodys=xmlhttp.responseText;
				document.getElementById(BodyID).innerHTML=Bodys;
			}
			else
			{
				alert("error");
			}
		}
	}
	xmlhttp.open("post", Url+".aspx", true);
	xmlhttp.setRequestHeader('Content-type','application/x-www-form-urlencoded');
	xmlhttp.send();
}
SendAjax("left","LeftID")