function popup_webshop_foto(aid)
{
  maxWidth = screen.availWidth;
  maxHeight = screen.availHeight;

  winWidth = 100;
  winHeight = 100;
  if(winWidth > maxWidth) winWidth = maxWidth;
  if(winHeight > maxHeight) winHeight = maxHeight;

  winLeft = (screen.width - winWidth) / 2;
  winTop = (screen.height - winHeight) / 2;

  url = "/webshop_foto.php?aid=" + aid;

  options = "status=no,scrollbar=yes,resize=yes,address=no,buttons=no,width=" + winWidth + ",height=" + winHeight + ",top=" + winTop + ",left=" + winLeft;
  w = window.open(url,"webteam_webshop_foto",options);
  w.focus();
}