<!-- Original:  Martin Webb (martin@irt.org) -->
<!-- hide from older browsers
function right(e) {
  if (navigator.appName == 'Netscape' && 
    (e.which == 3 || e.which == 2))
    return false;
  else if (navigator.appName == 'Microsoft Internet Explorer' && 
   (event.button == 2 || event.button == 3)) {
   alert("Sorry, you do not have permission to right click.");
   return false;
   }
   return true;
  }

document.onmousedown=right;
document.onmouseup=right;
if (document.layers) window.captureEvents(Event.MOUSEDOWN);
if (document.layers) window.captureEvents(Event.MOUSEUP);
window.onmousedown=right;
window.onmouseup=right;
//  End -->