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;