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; 
//--> 