trata asi
<table border="1" id="tabla" align="center">
<thead>
<tr>
<th colspan="4">q</th>
</tr>
</thead>
<tfoot >
<tr>
<th colspan="4" align="center">qasdasdasdasdasdas</th>
</tr>
</tfoot>
<tbody style="overflow-y:scroll;height:200px">
<tr>
<td>q</td>
<td colspan="2" style="padding-bottom:20px;">
qdasdasdasdasdasdasdasdasdasd
<br />
asdfasdfasdfasdf
<br />
asdfasdfasdf
<br />
asdf
<br />
as
<br />
df
<br />
asdf
<br />
asdf 111111111111111
<br />
</tfoot>
</table>
No se que tan estandar sea, al menos en FF funciona
SUERTE