function chdouble(adu,enf){
try {xhrdpd=new XMLHttpRequest();}
	catch(e){
		try {xhrdpd=new ActiveXObject("Microsoft.XMLHTTP");}
			catch(e1){
				alert("Objet non supporté");
			}
	}
xhrdpd.onreadystatechange=function(){
	if (xhrdpd.readyState==4)
		document.getElementById("chdouble").innerHTML=xhrdpd.responseText;
	else 
		document.getElementById("chdouble").innerHTML="<font size='1'>Patientez svp...</font>";
		}
xhrdpd.open('post','chdouble.php',true);
xhrdpd.setRequestHeader("Content-Type", "application/x-www-form-urlencoded");
//xhr.send(null);
xhrdpd.send("enf="+enf+"&adu="+adu);

}