Main Table width problem

[Kevin104]

I just added a new header to my forum and now the rest of the forum display seems to ignore my setting of 780 pixels. It just goes to the max. You can see what I'm talking about by going here (http://www.sprintusers.com/forum/index.php?s=&styleid=6).

Here is the code from the new header.
<table border="0" cellspacing="0" cellpadding="0" width="780" align="center">
<tr height="7">
<td bgcolor="#636B73">
</td>
</tr>
<td bgcolor="737B8C">
<font face="Verdana,Arial,Helvetica" size="1" color="white">
<b>&nbsp;
<a href="http://www.sprintusers.com"><font color="white">Home</font></a> |
<a href="http://www.sprintusers.com/forum"><font color="white"> Message Forum</font></a> |
<a href="http://www.sprintusers.com/news"><font color="white">News</font></a> |
<a href="http://www.sprintusers.com/downloads"><font color="white">Downloads</font></a> |
<a href="http://www.sprintusers.com/chat"><font color="white">Chat Room</font></a> |
<a href="http://www.sprintusers.com/forum"><font color="white">FAQ</font></a> |
<a href="http://www.sprintusers.com/mailinglist"><font color="white">Mailing List</font></a> |
<a href="http://www.sprintusers.com/links"><font color="white">Links</font></a> |
<a href="http://www.sprintusers.com/donate"><font color="white">Donate</font></a> |
<a href="http://www.sprintusers.com/about"><font color="white">About Us</font></a> |
<a href="http://www.sprintusers.com/contact"><font color="white">Contact Us</font></a> |
<a href="http://www.sprintusers.com/advertise"><font color="white">Advertise</font></a></b>
</font>
</td>
</tr>
<tr>
<td align="right" width="780" height="75" background="http://www.sprintusers.com/header/logo.jpg">

$advert&nbsp;&nbsp;
</td>
</tr><tr><td width="780" height="6"><img src="http://www.sprintusers.com/header/bottom.jpg" width="780" height="6"></td></tr>

</table><br>

<!-- Navigation Area -->
<table border="0" cellpadding="0" cellspacing="0" style="border-collapse: collapse" bordercolor="#111111" width="100%" id="AutoNumber3">
<tr>
<td width="100%" background="https://vborg.vbsupport.ru/images/topbg.gif">
<img border="0" src="https://vborg.vbsupport.ru/images/topbg.gif" width="2" height="14"></td>
</tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" style="border-collapse: collapse" bordercolor="#111111" width="100%" id="AutoNumber2" background="https://vborg.vbsupport.ru/images/navbg.gif">
<tr>
<td width="100%">
<img border="0" src="https://vborg.vbsupport.ru/images/navspacer.gif">
<a title="$hometitle" href="index.php?s=$session[sessionhash]"><img border="0" src="https://vborg.vbsupport.ru/images/home1.gif"></a>
<img border="0" src="https://vborg.vbsupport.ru/images/navspacer.gif">
$reg_or_cp
<img border="0" src="https://vborg.vbsupport.ru/images/navspacer.gif">
<a title="Search the forums" href="search.php?s=$session[sessionhash]"><img border="0" src="https://vborg.vbsupport.ru/images/search.gif"></a>
<img border="0" src="https://vborg.vbsupport.ru/images/navspacer.gif">
<a title="Frequently Asked Questions" href="misc.php?s=$session[sessionhash]&action=faq"><img border="0" src="https://vborg.vbsupport.ru/images/faq.gif"></a>
<img border="0" src="https://vborg.vbsupport.ru/images/navspacer.gif">
<a title="Member List" href="memberlist.php?s=$session[sessionhash]"><img border="0" src="https://vborg.vbsupport.ru/images/members.gif"></a>
<img border="0" src="https://vborg.vbsupport.ru/images/navspacer.gif"></td>
</tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" style="border-collapse: collapse" bordercolor="#111111" width="100%" id="AutoNumber4" background="https://vborg.vbsupport.ru/images/bottombg.gif">
<tr>
<td width="50%">
<img border="0" src="https://vborg.vbsupport.ru/images/bottombg.gif" width="2" height="14"></td>
</tr>
</table>

<br>

<!-- Forum Content Area -->
<div align="center">
<center>
<table border="0" cellpadding="0" cellspacing="0" style="border-collapse: collapse" bordercolor="#111111" width="98%" id="AutoNumber4" bgcolor="#FFFFFF">
<tr>
<td width="50%">
<img border="0" src="https://vborg.vbsupport.ru/images/topleft.gif" width="10" height="11"></td>
<td width="50%">
<p align="right">
<img border="0" src="https://vborg.vbsupport.ru/images/topright.gif" width="10" height="11"></td>
</tr>
<tr>
<td width="100%" colspan="2">
<table border="0" cellpadding="2" cellspacing="0" style="border-collapse: collapse" bordercolor="#111111" width="100%" id="AutoNumber8">
<tr>
<td width="100%">

What am I doing wrong?