if (window.Event)
 { document.captureEvents(Event.MOUSEUP); }
function nocontextmenu()
 {
  event.cancelBubble = true;
  event.returnValue = false;
  return false;
 }
function norightclick(e)
 {
  if (window.Event)
   {
     if (e.which == 2 || e.which == 3)
     return false;
   }
  else
   if (event.button == 2 || event.button == 3)
    {
     event.cancelBubble = true;
     event.returnValue = false;
     return false;
    }
 }
if (document.layers){ document.captureEvents(Event.MOUSEDOWN); }
document.oncontextmenu = nocontextmenu;
document.onmousedown = norightclick;
document.onmouseup = norightclick;