var w3c=document.getElementById && !document.all;
var ie=document.all;
pub_250x600= new Image();
pub_250x600.src = "images/pub/pub_600x250.gif";

if (ie||w3c) {
// déclaration des variables uniquement pour IE vive microsoft ?!!
var overlay;
var my_window;
}

function affiche_pub(){
montreoverlay('');
montrefenetre();
}

function montreoverlay() {
if (w3c||ie){
overlay = document.all ? document.all["overlay"] : document.getElementById ? document.getElementById("overlay") : ""
overlay.innerHTML = ''; // fixe le code HTML dans l'overlay balise (div)
overlay.style.visibility = "visible"; // modification du style
}
}

function montrefenetre() {
if (w3c||ie){
//affichage de la fenetre
my_window = document.all ? document.all['popup'] : document.getElementById ? document.getElementById('popup') : ""
my_window.style.visibility = "visible";
my_window.innerHTML = '<a href = "#" OnClick = "javascript:cachetout();"><img src="images/pub/INTER/pub_600x250.gif" border="0" width="600" height="250" alt="Publicite"></a>';
}
}

function cachetout() {
if (w3c||ie){
// masque la fenetre (balise div [window] )
my_window = parent.document.getElementById('popup');
my_window.style.visibility = "hidden";

// masque l'overlay (balise div [overlay])
my_window = document.all ? parent.document.all['overlay'] : parent.document.getElementById ? parent.document.getElementById('overlay') : ""
my_window.style.visibility = "hidden";
}
}