var message="Mouse right click is disabled!";

function clickIE4() {
    if (event.button==2) {
        return false;
    }
}

function clickNS4(e) {
    if (document.layers||document.getElementById&&!document.all) {
        if (e.which==2||e.which==3)	{
            alert(message);
            return false;
        }
    }
}

if (document.layers) {
    document.captureEvents(Event.MOUSEDOWN);
    document.onmousedown=clickNS4;
} else if (document.all&&!document.getElementById) {
    document.onmousedown=clickIE4;
} else {
    document.onmousedown=clickNS4;
}

document.oncontextmenu=new Function("return false")