function loadx(url,fn){
    xmlhttp=null;
    if (window.XMLHttpRequest) {xmlhttp=new XMLHttpRequest();}
    else if (window.ActiveXObject) {xmlhttp=new ActiveXObject("Microsoft.XMLHTTP");}

    if (xmlhttp!=null) {
      xmlhttp.onreadystatechange=fn;
      xmlhttp.open("GET",url,true);
      xmlhttp.send(null);
    }
    else {alert("Your browser does not support XMLHTTP requests.");}
}