if (window.Event) 
  document.captureEvents(Event.MOUSEUP); 
function novishtml()  
{
 event.cancelBubble = true
 event.returnValue = false;
 
 return false;
}
function noclickdx(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 = novishtml;  
document.onmousedown = noclickdx;