background color and valign aren't working in FireFox

[BUSHhtr]

Hello All
In my header - which is a SSI file I - I am using valign middle for our logo in the top row and I am using a background color for the smaller/not as important menu items which are in the second row - (the code below is minus the image swap stuff for the top row)
Here's the include file - it looks good in IE but not in Firefox Can someone help?
<table width="100%" border="0" cellpadding="0" cellspacing="0" >
<tr>
<td><table width="100%" border="0" cellspacing="0" cellpadding="0" >
<TR valign="middle">
<TD WIDTH=179 height="51" valign="baseline"><a href="default.asp"><img src="images/logo.gif" alt="Rockwell Institute logo" width="140" height="33" border="0"></a></TD>
td><table width="100%" border="0" cellspacing="0" cellpadding="0" class="topnav">
<TR>
<TD height="19" align="center" bgcolor="3e615d"><a href="asp/company/aboutUs.asp"id="nav3Header">About Rockwell</a> | <a href="asp/company/testimonials.asp"id="nav3Header">Testimonials</a> | <a href="asp/company/newsletter.asp"id="nav3Header">Email Newsletters</a> | <a href="asp/company/newsfeed.asp"id="nav3Header">Newsfeed</a> | <a href="asp/company/contact.asp"id="nav3Header">Contact Us</a> </TD>
</TR>
</table></td>
</tr>
</table>