function keypressed()
{
alert("Tasto disabilitato");
}
document.onkeydown=keypressed;

if (window.Event) // Only Netscape will have the CAPITAL E.
document.captureEvents(Event.MOUSEUP); // catch the mouse up event
function nocontextmenu()  // this function only applies to IE4, ignored otherwise.
{
        event.cancelBubble = true
        event.returnValue = false;
        return false;
}
function norightclick(e)        // This function is used by all others
{
        if (window.Event)       // again, IE or NAV?
        {
                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