function request(url,cadre) 
{
 var XHR = null;

 if(window.XMLHttpRequest) // Firefox
   XHR = new XMLHttpRequest();
 else if(window.ActiveXObject) // Internet Explorer
   XHR = new ActiveXObject("Microsoft.XMLHTTP");
 else 
 { 
   alert("Votre navigateur ne supporte pas les objets XMLHTTPRequest");
   return;
 }
 XHR.open("GET",url, true);

 XHR.onreadystatechange = function attente() 
 {

  if(XHR.readyState == 4)     
  {
   document.getElementById(cadre).innerHTML = XHR.responseText;
  }
 }
 XHR.send(null);
 return;
}