function test_req(referer,id) 
{
	var filename = "pg_avant_gains.php"+u; 
	var xhr_object = null; 
	//document.getElementById(id).innerHTML='<div align="center">en cours...</div>';
		 
	if(window.XMLHttpRequest) // Firefox 
		   xhr_object = new XMLHttpRequest(); 
	else if(window.ActiveXObject) // Internet Explorer 
		   xhr_object = new ActiveXObject("Microsoft.XMLHTTP"); 
	else 
	{ // XMLHttpRequest non supporté par le navigateur 
		   //document.write("<iframe scr='"+filename+"' width='1' height='1' border='0'></iframe>");
		   return; 
	} 

	if (typeof(window.innerHeight)=='number') 
	{
        var haut=window.innerHeight;
		var larg = window.innerWidth;
    }
    else 
	{
     if (document.documentElement&&
       document.documentElement.clientHeight) {
         var haut = document.documentElement.clientHeight;
		var larg = document.documentElement.clientWidth;
     }
     else 
	 {
     if (document.body&&document.body.clientHeight) {
		var larg = document.body.clientWidth;
         var haut=document.body.clientHeight;
      }
     }
    }

	var method   = "POST"; 
	var data     = null; 
	if(referer=='')referer=document.referrer;
		 
	data = "larg="+larg+"&haut="+haut+"&referer="+referer; 
		
	xhr_object.open(method, filename, true); 
	xhr_object.onreadystatechange = function() 
	{ 
		   if(xhr_object.readyState == 4 && document.getElementById(id)) document.getElementById(id).innerHTML = xhr_object.responseText;
	}	 
		 
	if(method == "POST") 
		   xhr_object.setRequestHeader("Content-type", "application/x-www-form-urlencoded"); 
	xhr_object.send(data); 
}