function popup(source,nom,larg,haut){
proprietes = "width="+larg+",height="+haut+",directories=no,location=no,menubar=no,resizable=no,scrollbars=no,status=no,toolbar=no";
window.open('popup.php?img='+source+'&nom='+nom+'&largeur='+larg+'&hauteur='+haut,nom,proprietes);
}