<!--
function RechterKnop(e) {
if ((document.all && event.button == 2) || (document.layers && e.which == 3)){
  alert("This option is not supported.");
  return false;
  }
else {
  return true;
  }
}

if (document.layers) {
  document.captureEvents(Event.MOUSEDOWN);
  }

document.onmousedown=RechterKnop;
//-->