function stats_clicks(fichier)
  {
  if(window.XMLHttpRequest) // FIREFOX
       xhr_object = new XMLHttpRequest(); 
  else if(window.ActiveXObject) // IE
       xhr_object = new ActiveXObject("Microsoft.XMLHTTP");
  else 
       return(false);
  xhr_object.open("GET", fichier, false); 
  xhr_object.send(null);
  }