//check ip
function aaGetXmlHttpRequest() {
   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;
}