if (window.Event)
document.captureEvents(Event.MOUSEDOWN);
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;