// JavaScript Document
var req = createXMLHttpRequest();  
function createXMLHttpRequest() {  
 var ua;  
 if(window.XMLHttpRequest) {  
 try {  
  ua = new XMLHttpRequest();  
 } catch(e) {  
  ua = false;  
 }  
 } else if(window.ActiveXObject) {  
  try {  
    ua = new ActiveXObject("Microsoft.XMLHTTP");  
  } catch(e) {  
    ua = false;  
  }  
 }  
return ua;  
}