function bobumTracker() {
  ref=parent==self ? escape(window.document.referrer) : escape(top.document.referrer);
  text = "<a href=\"http://www.bobum.nl/statistieken?id=" + bobumId + "\" target=\"_blank\">"
        +"<img border=\"0\" ";
  if ( typeof h != 'undefined' )
      text += (h!=null && h ? " style='visibility:hidden' " : "");
  if ( typeof i == 'undefined' )
      i = '';
  text += "src=\"http://www.bobum.nl/bobum.php?id=" + bobumId + "&ref=" + ref + "&img=" + i + "&uniq=" + new Date().getTime() + "\" /></a>";
  document.write(text);
}