如何用jQuery替换击键？

<script type=\"text/javascript\" src=\"jquery-1.6.1.min.js\"></script>
<script type=\"text/javascript\" src=\"jquery.simulate.js\"></script>
<script type=\"text/javascript\">
    $(function () {
        $(\"select\").each( function() {
                $(this).keydown(function(event) {
                    if (event.which == \'39\') {
                        $(this).simulate(\"keydown\", { keyCode: 9, ctrlKey: false, shirtKey: false });
                        $(this).simulate(\"keypress\", { keyCode: 9, ctrlKey: false, shirtKey: false });
                        $(this).simulate(\"keyup\", { keyCode: 9, ctrlKey: false, shirtKey: false });
                        return false;
                    }
            });
        });
    });
</script>