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;