function ouvreRech() {
   if (typeof(nt) != 'undefined' && ! nt.closed){nt.close()}
   nt=window.open("recherche.php?grouper=on", "recherche", "width=950,height=800,scrollbars=yes,resizable=yes");
   larg = screen.width;
   posx = larg - 950;
   nt.moveTo(posx, 50);
}