este codigo esta bien o le falta algo?
<table class="forumline" width="100%" border="0" cellspacing="1" cellpadding="0" id="chatbox_container">
<tr>
<td class="row1" valign="top" align="center">
<div id="chatbox_portal" style="height:300px;"></div>
<script type="text/javascript">
insertChatBox('chatbox_portal', '{U_FRAME_CHATBOX}');
</script>
</td>
</tr>
</table>
<table width="100%">
<tr>
<td width="100%"> </td>
<td align="right" width="20">
<img src="" onmousedown="javascript
:resizeElement(event, 'chatbox_portal');" alt="" style="cursor:se-resize;"/>
</td>
</tr>
</table>