Disable right click using javascript

<script type="text/javascript">

    var message = "";

    function clickIE() {
        if (document.all)
        { (message); return false; }
    }

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

    if (document.layers)
    { document.captureEvents(Event.MOUSEDOWN); document.onmousedown = clickNS; }
    else
    { document.onmouseup = clickNS; document.oncontextmenu = clickIE; }
    document.oncontextmenu = new Function("return false")

</script>