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;