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;