function BGOeffnen(url)
{
  var height = "560";
  var width = "700";
  
  var top = screen.height / 2 - height / 2;
  var left = screen.width / 2 - width / 2;
  
  window.peterfoto_bg = window.open(url, "peterfoto_bg", "resizable=1,toolbar=0,location=0,directories=0,status=1,menubar=0,scrollbars=1,height=" + height + ",width=" + width + ",top=" + top + ",left=" + left);
  window.peterfoto_bg.focus();
}

function BGSchliessen()
{
  if (window.peterfoto_bg && !window.peterfoto_bg.closed) {
    window.peterfoto_bg.close();
  }
}