function quoted(str) {
  return (str != null) ? '"' + str + '"' : '""';
}

function radarfalle_show_ad() {
  var w = window;
  w.radarfalle_ad_url = 'http://mobile.radarfalle.de/tracker.php?' +
                    'client=' + w.radarfalle_ad_client +
                    '&laender=' + w.radarfalle_laender +
                    '&bg=' + w.radarfalle_color_bg +
                    '&link=' + w.radarfalle_color_link +
                    '&text=' + w.radarfalle_color_text +
                    '&farbeeins=' + w.radarfalle_color_t1 +
                    '&farbezwei=' + w.radarfalle_color_t2 +
                    '&width=' + w.radarfalle_ad_width +
                    '&height=' + w.radarfalle_ad_height;

      document.write('<iframe' +
                     ' name="radarfalle_ads_frame"' +
                     ' width=' + quoted(w.radarfalle_ad_width) +
                     ' height=' + quoted(w.radarfalle_ad_height) +
                     ' frameborder="0"' +
                     ' src=' + quoted(w.radarfalle_ad_url) +
                     ' marginwidth="0"' +
                     ' marginheight="0"' +
                     ' vspace="0"' +
                     ' hspace="0"' +
                     ' allowtransparency="true"' +
                     ' scrolling="yes">' +
                     '</iframe>');
}

radarfalle_show_ad();