if (window.Event) // Only Netscape will have the CAPITAL E. 
  document.captureEvents(Event.MOUSEUP); // catch the mouse up event 
  
function nocontextmenu()  // this function only applies to IE4, ignored otherwise. 
{ 
 event.cancelBubble = true 
 event.returnValue = false; 
  
 return false; 
} 
  
function norightclick(e) // This function is used by all others 
{ 
 if (window.Event) // again, IE or NAV? 
 { 
  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;  // for IE5+ 
document.onmousedown = norightclick;  // for all others