isIE4 = (document.all) ? true : false;
isW3C = (document.getElementById && !isIE4) ? true : false;
isNN4 = (document.layers) ? true : false;
function rightClickDown(e) { return (e.which == 3) ? putAlert() : true; }
function putAlert() 
{
    alert(sorryMsg);
    return false;
}

if (isIE4) document.oncontextmenu=putAlert;
if (isW3C) document.onmouseup=rightClickDown;
if (isNN4) {
    window.captureEvents(Event.MOUSEDOWN);
    window.onmousedown=rightClickDown;
           }