function preload(method, url, type, calque, recup, data)
	{
	var textAnt="";
	if(recup) textAnt=document.getElementById(calque).innerHTML;
	if (window.XMLHttpRequest)              				//  Objet de la fenêtre courant
		{
		xhr = new XMLHttpRequest();							//  Firefox, Safari, ...
		} 
	else
		if (window.ActiveXObject)            				//  Version Active
			{
			xhr = new ActiveXObject("Microsoft.XMLHTTP");   // Internet Explorer 
			}
	xhr.onreadystatechange = function()
		{ 
		document.getElementById(calque).innerHTML="<p align='center'><img src='../kit/load.gif' /></p><p align='center'>Chargement en cours...</p>";
		if(xhr.readyState == 4)
			{
		    if(xhr.status == 200)
				{
		        document.getElementById(calque).innerHTML=textAnt + xhr.responseText;
				}
			else 
				{ 
				document.ajax.dyn.value="Error: returned status code " + 
				xhr.status + " " + xhr.statusText;
				} 
			} 
		};
	xhr.open(method, url, type);
	xhr.setRequestHeader("Content-Type", "application/x-www-form-urlencoded");
	xhr.send(data);
	}