lightweight jQuery countdown
<p>I've seen some really nice looking jQuery plugins to count down the number of day, hours, minutes and seconds.  They use images and look great.
But I'm looking for a simple little countdown that populates a div with the number of seconds remaining.
I'm going to use it in conjunction with:</p>

<pre><code>function submitform() {
    document.forms[0].submit();
}

jQuery(function($) {
    setInterval("submitform()",20000);
});
</code></pre>

<p>I just want something real unobtrusive in the corner somewhere to let them know that the page is about to refresh all by itself.</p>
