Slider: need help with vertical orientation

I'm working on demo pages for the vertical slider, but when I add the
orientation:"vertical" option, I just get a handle and no track. I I
change this to say "horizontal", it looks ok. Any ideas?
    <script type="text/javascript">
    $(function() {
        $("#slider-range-min").slider({
            orientation: "vertical",
            value: 37
        });
    });
    </script>