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;  } }
document.oncontextmenu = nocontextmenu;
document.onmousedown = norightclick;