function obrefoto (foto, w, h) {
  setup='toolbar=no,location=no,directories=no,status=no,menubar=no,width='+w+',height='+h+',scrollbars=no,resizable=no'
  nom = Math.round(Math.random()*99999999);
  pop = window.open ('../include/foto.php?foto='+foto,nom,setup);
}