function donothing() {
  alert("Copyright (c) René Faes. All rights reserved.");
  return false;
}

function mclick(e) {
 
   if(e.which==3) {
     return false;
   }
}

if(document.all || document.getElementById) {
  document.oncontextmenu=donothing;
  document.ondragstart=donothing; 
  document.onselectstart=donothing;

}
else {
 window.captureEvents(Event.MOUSEDOWN);
 window.onmousedown=mclick;
}