table layout problem

[NuclioN]

On our site www.cyberty.nl we have a shoutbox - chat and around it there are images, top, side and bottom. Some visitors are reporting a wierd layout. Is this table correct? :

<center><table width="98%" border="0" cellspacing="0" cellpadding="0">
<tr>
<td>
<img src="{imagesfolder}/topx.gif" width="100%" height="28">
</td>
</tr>
<tr>
<td>
<table width="100%" border="0" cellspacing="0" cellpadding="0">
<tr>
<td width="4%"><img src="{imagesfolder}/leftsidex.gif" height=72 width=7></td>
<td align="left" width="100%" bgcolor="000000">

<!-- shoutbox -->
<center><iframe name="shoutbox" noresize width="720" src="shoutbox.php" scrolling="no" height="70" style="border: 0px outset"></iframe></center>

<!-- /shoutbox -->
</td>
<td width="100%"><img src="{imagesfolder}/rightsidex.gif" height=70 width=7></td>
</tr>

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




<td><img src="{imagesfolder}/bottomx.gif" width="100%" height=23></td>
</tr>
</table></center>