Your problem is here:
<!-- / ROUNDED CORNERS TOP BEGIN -->
<table border="0" cellpadding="0" cellspacing="0" style="border-collapse: collapse" bordercolor="#111111;" width="100%">
<tr>
<td width="5" height="5" style="background-image: url('http://www.mmohell.com/tl.png')"></td>
<td height="5" style="background-image: url('http://www.mmohell.com/t.png')"></td>
<td width="5" height="5" style="background-image: url('http://www.mmohell.com/tr.png')"></td>
</tr>
<tr>
<td width="5" style="background-image: url('http://www.mmohell.com/l.png')"> </td>
<td>
<!-- / ROUNDED CORNERS TOP END -->
<!-- toolbar -->
<table class="tborder" cellpadding="6" cellspacing="1" border="0" width="100%" align="center" style="border-bottom-width:0px">
<tr>
<td class="tcat" width="100%">
<div class="smallfont">
</div>
</td>
<td class="vbmenu_control" id="threadtools" nowrap="nowrap">
<a href="/showthread.php?t=2&nojs=1#goto_threadtools">Thread Tools</a>
<script type="text/javascript"> vbmenu_register("threadtools"); </script>
</td>
<td class="vbmenu_control" id="displaymodes" nowrap="nowrap">
<a href="/showthread.php?t=2&nojs=1#goto_displaymodes">Display Modes</a>
<script type="text/javascript"> vbmenu_register("displaymodes"); </script>
</td>
</tr>
</table>
<!-- / toolbar -->
<!-- end content table -->
</div>
</div>
</div>After you do the rounded colors, you have a table started to do the Thread Tools and then you close the table and have three ending div tags. Right before that table, you have the td tag started. So, you are either missing the three beginning div tags or you are missing a closing td tag, or some combination of the two. I would double check the installation instructions for the rounded corner mod cuz you probably didn't install it correctly.