function file(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.setRequestHeader('Content-Type','text/html; charset=iso-8859-1');
xhr_object.send(null);
if(xhr_object.readyState == 4) return(xhr_object.responseText);
else return(false);
}
	 
function afficher(id)
  {
  if (document.getElementById && document.getElementById(id) != null)
    {
    document.getElementById(id).style.visibility='visible';
    document.getElementById(id).style.display='block';
    }
  }

function fermer(id)
  {
  
    document.getElementById(id).style.visibility='hidden';
    document.getElementById(id).style.display='none';
   
  }