<!--
 var message="This opperation not allowed.";
 function click(z) {
  if (document.all) {
   if (event.button == 2) {
    alert(message);
    return false;
   }
  }
  if (document.layers) {
   if (z.which == 3) {
    alert(message);
    return false;
   }
  }
 }
 if (document.layers) {
  document.captureEvents(Event.MOUSEDOWN);
 }
 document.onmousedown=click;
// -->