function FormatBanniere() {
  i = document.form.format.selectedIndex;
 
  url = document.form.format.options[i].value;
  parent.location.href = url;
}

function PopupCentrer(page,largeur,hauteur,options) {
  var top=50;
  var left=(screen.width-largeur)/2;
  window.open(page,"","top="+top+",left="+left+",width="+largeur+",height="+hauteur+","+options);
}