function getXhr(){
var xhr = null; 
	if(window.XMLHttpRequest)
	   xhr = new XMLHttpRequest(); 
	else if(window.ActiveXObject){ 
	   try {
				xhr = new ActiveXObject("Msxml2.XMLHTTP");
			} catch (e) {
				xhr = new ActiveXObject("Microsoft.XMLHTTP");
			}
	}
	else {
	   alert("Veuillez changer de navigateur pour utiliser ce site."); 
	   xhr = false; 
	} 
					return xhr;
}
//--------------------------------------------
//--------------------------------------------
//--------------------------------------------
function go(page,page_get,pointer,loader,id_qt)
{
var xhr = getXhr();
xhr.onreadystatechange = function(){
	if(xhr.readyState == 4 && xhr.status == 200)
	{
		rep = xhr.responseText;
		document.getElementById(pointer).innerHTML = rep;
	}
	else if(xhr.readyState == 1) document.getElementById(loader).innerHTML = "<br><br><br><br><center>Chargement en cours...</center>";
}

if (id_qt != "") var qt = document.getElementById("quantite"+id_qt).value;
else var qt = 1;

if (page_get == "") var sep = "?";
else var sep = "&";

if (page == "all_ajax") pointer0 = "all_ajax.php"+page_get+sep+"qt="+qt;
else pointer0 = "all_ajax.php?p=erreur";

xhr.open("POST",pointer0,true);
xhr.setRequestHeader('Content-Type','application/x-www-form-urlencoded');

xhr.send(null);
}