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