var xmlhttp;
    function loadXMLDoc(url)
    {
    xmlhttp=null;
    // code for Mozilla, etc.
    if (window.XMLHttpRequest)
      {
      xmlhttp=new XMLHttpRequest();
      }
    // code for IE
    else if (window.ActiveXObject)
      {
      xmlhttp=new ActiveXObject("Microsoft.XMLHTTP");
      }
    if (xmlhttp!=null)
      {
      //xmlhttp.onreadystatechange=state_Change;
      xmlhttp.open("GET",url,true);
      xmlhttp.send(null);
      }
    else
      {
      alert("Your browser does not support XMLHTTP.");
      }
    }