// JavaScript Document
var xmlhttp;
 function createHTTP()
{
       //根据不同的浏览器创建XMLHttpRequest
        if(window.ActiveXObject)
        {
           xmlhttp=new ActiveXObject("Microsoft.XMLHTTP");
        }
        else if(window.XMLHttpRequest)
        {
           xmlhttp=new XMLHttpRequest();
}
}
var boxid;
function getad(id)
{
	  document.getElementById(boxid).innerHTML = "<div align=\"center\"><img align='absmiddle' src=\"../images/loading.gif\"alt=\"\"/>  正在下载...</div>";
	  createHTTP();
	  xmlhttp.Open("GET","../ad/Ad_Ajax.aspx?id="+id,true);
	  xmlhttp.setRequestHeader("charset","utf-8");
	  xmlhttp.onreadystatechange=stateChange;
	  xmlhttp.Send(null);
}
function stateChange()
{
   if(xmlhttp.readystate==4 && xmlhttp.status==200)
   {
	  document.getElementById(boxid).innerHTML=xmlhttp.ResponseText;
   }
}