Forcing TD or TR to limit height

Hello all, I was just wondering if you could help me out with a little problem I seem to be having. You see, I have the following layout ( basically )

<tr>
<td>
<div>
<script>Javascript that places a flash file here</script>
</div>
</td>
</tr>

The flash file is a sort of search bar, that has the option to apply filters. When you click filters, The bottom part of the flash file is unmasked ( transparent background ) So it’s supposed to look like it’s overlapping all the static html underneath it (Kind of like a drop down menu) . The only problem is, the TD automatically adjusts itself to the entire movie’s height ( 400px ) to fit the initially masked content. I was just wondering how I could force the TD ( or TR) to be no bigger than, say 20px? I’ve tried screwing with the overflow, and obviously the height but I still have found no success. Any help would be much appreciated, thank you.