div align bottom inside a td

[tgh003]

Lets say I have some html/css like so:

<style>
..stdtable td { border: 1px solid #999; }
</style>

<table class="stdtable">
<tr>
<td style="vertical-align:top; height:400px; width: 100px;">
this is the left side of my screen<br />
</td>

<td style="vertical-align:top; width: 500px;">
This is the main body of my screen

<div>this should be aligned at the bottom of the td body</div>

</td>
</tr>
</table>

I want the DIV to go to the bottom of the body TD. How would I do
this? I cannot change the tables, so those are static. Anyway to do
this? Any help is appreciated. Thanks.