There are 146 'warnings' errors ("warnings" are 'error-lites', -meaning proprietary such as IE-only or NS-only, etc., deprecated tags [old, outdated, etc]. Most are easily dismissable.
This 'warning' is potentially page-layout busting:
line 55 column 23 - Warning: missing </a> before </td>
meaning that an anchor is not properly closed, it could be making the next element partially a 'link', thus causing the three links to be right-shifted in Firefox (whereas IE will incorrectly ignore a missing or misplaced end/closing tag..).