var message = "www.willemderidder.com  \nVersion 2.2 - 2002/2004";

function click(e) {
 if (document.all) {
  if (event.button == 2) {
   //alert(message);
   return false;
  }
 }
 if (document.layers) {
  if (e.which == 3) {
   //alert(message);
   return false;
  }
 }
}

if (document.layers) {
 document.captureEvents(Event.MOUSEDOWN);
}

document.onmousedown=click;