var largeur=574;
var hauteur=368;
var options="menubar=no,scrollbars=yes,statusbar=no" ;
function PopupCentrer(page) {

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