I need help modifying some table properties?

[Evaporate]

<!-- Chatbox -->

<table class="tborder" cellpadding="4" cellspacing="1" border="0" width="100%" align="center">

<thead>
<tr>
<td class="tcat"><a style="float:right" href="#top" onclick="return toggle_collapse('forumhome_chatboxtop')"><img id="collapseimg_forumhome_chatboxtop" src="$stylevar[imgdir_button]/collapse_tcat.gif" alt="" border="0" /></a><a href="#" onclick="return openChatbox()">$vbphrase[chatbox_chatbox]</a></td>
</tr>
</thead>
<tbody id="collapseobj_forumhome_chatboxtop" style="">
<tr>
<td class="alt1" width="100%" colspan="2"><div class="smallfont" align="center"><iframe src="chatbox.php?nofocus=1" width="100%"$chatboxheight style="border: 0px" frameborder="0"></iframe></div></td>
</tr>
</tbody>
</table>
<br />


I've tried it but it just adds another header to my chatbox et al. The above script is my chatbox script?