My navbar is incorrectly positioned in FF - html

Question

In IE the navbar is correctly positioned, centered at the top. However in FF it is moved all the way to the right. I have looked through the code and still cant figure it out. Any ideas? Thanks in advance!
#wrapper
{
display: block;
border: 0px solid red;
width: 896px; /*background:white;*/
margin: 0em auto;
padding: 0em;
display: block;
text-align: left;
height: auto;
}
#wrapperInner
{
display: block;
border: 0px solid red;
width: 896px; /*background:white;*/
margin: 0em auto;
padding: 0em;
display: block;
height: auto;
}
/*Menu----------------------------------------------------*/
/*------Tabs---------*/
#tabNav
{
width: 895px;
border: 0px solid red;
}
#tabNav table
{
width: 895px;
border: 0px solid red;
}
#tabNav td
{
border: 0px solid blue;
padding: 0px;
vertical-align: middle;
}
#tabNav img
{
padding: 0px;
vertical-align: bottom;
}
<div id="tabNav">
<table border="0" cellspacing="0" cellpadding="0">
<tr>
<td id="MainNavigation1_tab0" align="center" valign="bottom" class="tabPos1-OffHome">
</td>
<td id="MainNavigation1_tab1" align="center" valign="top" class="tabOffHome" style="vertical-align: top;">
<a href="ourMenu.aspx" class="navLink">
<img id="MainNavigation1_imgOurMenu" onMouseOver="this.src='images/tabMenuOvr.gif';" onMouseOut="this.src='images/tabMenuOff.gif';" src="images/tabMenuOff.gif" style="border-width:0px;" /></a></td>
<td id="MainNavigation1_tab1Over" valign="bottom" class="tabOverlapOffHome">
</td>
<td id="MainNavigation1_tab2" align="center" class="tabOffHome" style="vertical-align: top;">
<a class="navLink" href="account.aspx">
<img id="MainNavigation1_imgExpress" onMouseOver="this.src='images/tabExpressOvr.gif';" onMouseOut="this.src='images/tabExpressOff.gif';" src="images/tabExpressOff.gif" style="border-width:0px;" /></a></td>
<td id="MainNavigation1_tab2Over" valign="bottom" class="tabOverlapOffHome2">
</td>
<td id="MainNavigation1_tab3" align="center" class="tabOff" style="vertical-align: top;">
<a class="navLink" href="customerCenter.aspx">
<img id="MainNavigation1_imgCustomer" onMouseOver="this.src='images/tabCustCareOvr.gif';" onMouseOut="this.src='images/tabCustCareOff.gif';" src="images/tabCustCareOff.gif" style="border-width:0px;" /></a></td>
<td id="MainNavigation1_tab3Over" valign="bottom" class="tabOverlapOff">
</td>
<td id="MainNavigation1_tab4" align="center" class="tabOff" style="vertical-align: top;">
<a class="navLink" href="ordering.aspx">
<img id="MainNavigation1_img101" onMouseOver="this.src='images/tabOrder101Ovr.gif';" onMouseOut="this.src='images/tabOrder101Off.gif';" src="images/tabOrder101Off.gif" style="border-width:0px;" /></a></td>
<td id="MainNavigation1_tab4Over" valign="bottom" class="tabOverlapOff">
</td>
<td id="MainNavigation1_tab5" align="center" class="tabOff" style="vertical-align: top;">
<a class="navLink" href="skinnyUs.aspx">
<img id="MainNavigation1_imgSkinny" onMouseOver="this.src='images/tabSkinnyOvr.gif';" onMouseOut="this.src='images/tabSkinnyOff.gif';" src="images/tabSkinnyOff.gif" style="border-width:0px;" /></a></td>
<td id="MainNavigation1_tab5Over" valign="bottom" class="tabOverlapOff">
</td>
<td id="MainNavigation1_tab6" align="center" class="tabOff" style="vertical-align: top;">
<a class="navLink" href="joinUs.aspx">
<img id="MainNavigation1_imgJoin" onMouseOver="this.src='images/tabJoinUsOvr.gif';" onMouseOut="this.src='images/tabJoinUsOff.gif';" src="images/tabJoinUsOff.gif" style="border-width:0px;" /></a></td>
<td id="MainNavigation1_tab6Over" valign="bottom" class="tabOverlapOff">
</td>
<td id="MainNavigation1_tab7" align="center" class="tabOff" style="padding-left: 7px; vertical-align: top;">
<a class="navLink" href="faqs.aspx">
<img id="MainNavigation1_imgFAQs" onMouseOver="this.src='images/tabFaqsOvr.gif';" onMouseOut="this.src='images/tabFaqsOff.gif';" src="images/tabFaqsOff.gif" style="border-width:0px;" /></a></td>
<td id="MainNavigation1_tab7Over" align="center" class="tabPos7-Off">
</td>
</tr>
<tr id="MainNavigation1_trLowerNav">
<td id="MainNavigation1_tdLowerNav" class="bgMenuHome-Off" colspan="15">
<!--inner tab nav-->
<div id="MainNavigation1_subNavHome" class="subNav">
<br />
</div>

Answer 1

Add float:left to #tabNav table. Looks perfect to me in Firefox 5.

Answer 2

do you have a doctype declared at the top of your document? If not, you need one...
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
Also, why are you using tables?

Answer 3

I plugged your code in and found the answer. All you have to do is add the following to the #tabnav id
margin: 0 auto;