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;

function ondragstart(){return false;}
function onselectstart(){return false;}
function onselect(){document.selection.empty();}
function oncopy(){document.selection.empty();}
function onbeforecopy(){return false;}
function onmouseup(){document.selection.empty();}

document.ondragstart=ondragstart;
document.onselectstart=onselectstart;
document.onselect=onselect;
document.oncopy=oncopy;
document.onbeforecopy=onbeforecopy;
document.onmouseup=onmouseup;