<script type="text/javascript">

//<![CDATA[

function click (e) {

  if (!e)

    e = window.event;

  if ((e.type && e.type == "contextmenu") || (e.button && e.button == 2) || (e.which && e.which == 3)) {

    if (window.opera)

      window.alert("Sorry: Diese Funktion ist deaktiviert.");

    return false;

  }

}

if (document.layers)

  document.captureEvents(Event.MOUSEDOWN);

document.onmousedown = click;

document.oncontextmenu = click;

//]]>

</script>