Display value in jQueryUI ProgressBar

I've set up a simple jQuery UI ProgressBar:

<script type="text/javascript">
    $(function() {
        $("#progressbar").progressbar({
                value: 35
        });
    });
</script>
<div id="progressbar">  </div>

Among other things, I'd like to display some text in the progress-bar (for starters, I'd just use the "value").

I can't seem to get this to work.

Bonus Question: How do I format the displayed text (e.g. color, alignment)?