function dim2(str)
{
   str = "foto01.htm";
   XX = (screen.width / 2) - (600 / 2);
   YY = (screen.height / 2) - (600 / 2);
   PopBigFoto = window.open(str,"foto","width=600,height=600,scrollbars=no,status=no");
   PopBigFoto.moveTo(XX,YY);
   PopBigFoto.focus();
}