You have two TD attributes inside the TR without closing that TR and opening a new TR. Use TD colspan=2 for the image (if necessary, I didn't look that far, you might just need to remove the second td attribute) and end the TR, then begin a new TR and new TD.
In
http://ncis.butterfly-dreams.com/gallery/themes/classic/template.html you have:
<table width="75%" border="0" cellpadding="20" cellspacing="20">
<tr>
<td valign="top" style="border: 1px solid #666666;background-color:#FFFFFF;">
<table width="100%" border="0" cellspacing="0" cellpadding="0">
<tr>
<td>
<a href="index.php"><img src="themes/classic/images/ncis.gif" border="0" alt="" /></a><br />
</td>
<td width="100%" align="Center">
<p style="margin-top: 10px; margin-left: 0px;"><b>{SYS_MENU}</b></p>
<p style="margin-top: 10px; margin-right: 10px"><b>{SUB_MENU}</b></p>
</td>
</tr>
</table>
I closed the table data cell and opened a new table row with a new table data cell here:
<table width="100%" border="0" cellpadding="20" cellspacing="20">
<tr>
<td valign="top" style="border: 1px solid #666666;background-color:#FFFFFF;">
<table width="100%" border="0" cellspacing="0" cellpadding="0">
<tr>
<td>
<a href="index.php"><img src="themes/classic/images/ncis.gif" border="0" alt="" /></a><br />
</td>
</tr>
<tr><td align="center" valign="center">
<p style="margin-top: 10px; margin-left: 0px;"><b>{SYS_MENU}</b></p>
<p style="margin-top: 10px; margin-right: 10px"><b>{SUB_MENU}</b></p>
</td>
</tr>
</table>
Modify and add your classes to suit.