How do I move this div down the page when user scrolls down?
<p>In this example:  <a href="http://jsfiddle.net/3YrDD/" rel="nofollow">http://jsfiddle.net/3YrDD/</a></p>

<p>How do I make the "SideBar" move down as the user scrolls the main content down?  I would like it to stop at the footer.  </p>
