function ajaxInit(){
   var xmlhttp;

   try {
      xmlhttp = new XMLHttpRequest();
   } catch(ee) {
      try {
         xmlhttp = new ActiveXObject("Msxml2.XMLHTTP");
      } catch(e) {
         try {
            xmlhttp = new ActiveXObject("Microsoft.XMLHTTP");
         } catch(E) {
            xmlhttp = false;
         }
      }
   }

   return xmlhttp;

}