function getXmlhttp()
{
 	var xmlhttp 
     if (window.XMLHttpRequest) 
     { 
         //isIE = false; 

         xmlhttp = new XMLHttpRequest(); 
     } 
     else if (window.ActiveXObject) 
     { 
         //isIE = true; 

         xmlhttp = new ActiveXObject("Microsoft.XMLHTTP"); 
     } 
     
     return xmlhttp;

}