function click (e) {
  if (!e)
    e = window.event;
  if ((e.type && e.type == "contextmenu") || (e.button && e.button == 2) || (e.which && e.which == 3)) {
    pos = (document.layers || (document.getElementById && !document.all)) ? e.pageY :     document.body.scrollTop + event.clientY;
    // falls Maus im Headerbereich
    if (pos < 60) {
      window.alert("Hier finden Sie die IEC Logos zum Download: http://ieconline.de/logo-download\n\nPlease, use the following page to download the IEC logo: http://ieconline.de/logo-download-en");
      return false;
    }
  }
}

document.oncontextmenu = click;