var xhr=null;

function load_menu(user){

if (window.XMLHttpRequest)
{// code for Firefox, Opera, IE7, etc.
xhr =new XMLHttpRequest();
}
else if(window.ActiveXObject)
{// code for IE7, IE6, IE5
xhr =new ActiveXObject("Microsoft.XMLHTTP");
}
if (xhr!=null)
{

xhr.onreadystatechange=Menu;

xhr.open("GET","Backend.php?user="+user,false);

xhr.send(null);

}else { alert("Your browser does not support XMLHTTP."); }

return true;
}