height of an element javascript
<p>I would like to adjust the size of an element in the opposite direction, so the code below does adjust it, but it enlarges it from current position to bottom, I want current position to top. What would be an efficient way of doing this? thanks</p>

<pre><code>var ele=document.getElementById('mydiv');
ele.style.height = 500+'px';
</code></pre>
