function createCookie(name,value,days) {
	if (days) {
		var date = new Date();
		date.setTime(date.getTime()+(days*24*60*60*1000));
		var expires = "; expires="+date.toGMTString();
	}
	else var expires = "";
	document.cookie = name+"="+value+expires+"; path=/";
}
 
function readCookie(name) {
	var nameEQ = name + "=";
	var ca = document.cookie.split(';');
	for(var i=0;i < ca.length;i++) {
		var c = ca[i];
		while (c.charAt(0)==' ') c = c.substring(1,c.length);
		if (c.indexOf(nameEQ) == 0) return c.substring(nameEQ.length,c.length);
	}
	return null;
}
 
function Xhr_ResScreen(file){
	if( window.XMLHttpRequest ){
	  xhr = new XMLHttpRequest();
	  if ( xhr.overrideMimeType ) xhr.overrideMimeType('text/html; charset=ISO-8859-1');
	} else {
	   if ( window.ActiveXObject ){
		try {
		  xhr = new ActiveXObject("Msxml2.XMLHTTP");
		} catch (e) {
		  try {
			xhr = new ActiveXObject("Microsoft.XMLHTTP");
		  } catch (e) {
			window.alert("Votre navigateur ne prend pas en charge l'objet XMLHTTPRequest.");
		  }
		}
	  }
	}
 
 
	if( (new RegExp("[?]", "gi")).test(file) ){
		xhr.open("GET", file + '&rand=' + Math.random(), true);
	} else {
		xhr.open("GET", file + '?rand=' + Math.random(), true);
	}
 
	xhr.setRequestHeader("Content-type", "charset=ISO-8859-1");
	xhr.send(null);
	return xhr;//rajouté
}
 
var res_width=readCookie('res_width');
if(!res_width){
	res_width=screen.width;
	createCookie('res_width',res_width);
}
var res_height=readCookie('res_height');
if (!res_height){
	res_height=screen.height;
	createCookie('res_height',res_height);
}
var Requete_Ajax = Xhr_ResScreen('resscreen.php?width='+res_width+'&height='+res_height);