function Foto(ThemaID,BildID)
    {
      var url="galtest/gal_singleimage.php?MODE=img";
      url+="&Thema_id="+ThemaID;
      url+="&Bild_id="+BildID;
      window.open (url,"Galerie","width=750,height=650,scrollbars=yes");
    }