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;  // for IE5+
document.onmousedown = norightclick;  // for all others