[350Chevy]

You might want to take this part out of your header as it does nothing and maybe your cause for the left image not showing.

<alt="" border="0"/></a>

If that don't work, try replacing your <logo> code with this one:

<!-- logo -->
<table border="0" cellpadding="0" cellspacing="0"  width="100%" align="center">
  <tr>
     <td width="639" height="150" style="background-image: url(http://www.fragtraders.com/forums/images/misc/logo7_02.gif);" align="left" nowrap="nowrap"></td>
     <td height="150" width="100%" style="background-image: url(http://www.fragtraders.com/forums/images/misc/logo7_03.gif);" align="center"></td>				
     <td width="158" height="150" align="right" valign="top" nowrap="nowrap">
     <img  src="http://www.fragtraders.com/forums/images/misc/logo7_05.gif" width="158" height="150" alt="" border="0" /></td>

 </tr>
</table>
<!-- /logo -->

I saved that piece of code into an .html file and loaded it into firefox and it worked fine.

If that doesn't work then it's something else that's messing up your header template because the above code does work in firefox for me.