Animation with pure javascript, no jquery
<p>I was using jquery/jquery-ui's <code>slideDown()</code> animation function for a particular task. It now transpires that I will not be able to use jQuery in this project. I also cant use YUI or any other libraries. So I wondering is there a way to perform a slideDown style animation using pure javascript?</p>

<p><strong>Edit:</strong> I have to do it without jQuery because I am using selenium to control a webpage and on this particular site adding jQuery to the page breaks event handlers for some reason.</p>
