function createAjaxObj(){

   var httprequest=false

   if (window.XMLHttpRequest){ // if Mozilla, Safari etc

      httprequest=new XMLHttpRequest()
      if (httprequest.overrideMimeType)httprequest.overrideMimeType('text/xml')

   } else if (window.ActiveXObject){ // if IE
      try {
         httprequest=new ActiveXObject("Msxml2.XMLHTTP");
      } catch (e){
         try{
            httprequest=new ActiveXObject("Microsoft.XMLHTTP");
         } catch (e){}
      }
   }
   return httprequest;
}

   // XMLHttpRequestObj
ajaxobj=createAjaxObj();