how to disable new tab in web browser..?

<script language=JavaScript>




        var message = "disable right click";

        ///////////////////////////////////
        function clickIE4() {
            if (event.button == 2) {
                alert(message);
                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;
        }

        document.oncontextmenu = new Function("alert(message);return false")


</script>