function getXmlHttpRequest() {
   var xmlHttpObj;
   if (window.XMLHttpRequest) {
      xmlHttpObj = new XMLHttpRequest();
   } else {
      try
         {
            xmlHttpObj = new ActiveXObject("Msxml2.XMLHTTP");
         }
         catch (e)
         {
            try
            {
               xmlHttpObj = new ActiveXObject("Microsoft.XMLHTTP");
            }
            catch (e)
            {
               xmlHttpObj = false;
            }
         }
    }
   return xmlHttpObj;
}