Layout Problem in FF?

[windows]

I've got this layout which looks like i want it to in IE however in FF it doesn't at all and i'm not sure why any ideas?

URL: <!-- m --><a class="postlink" href="http://www.rocketss.com/franks/sitemap/index2.php">http://www.rocketss.com/franks/sitemap/index2.php</a><!-- m -->

CSS: <!-- m --><a class="postlink" href="http://www.rocketss.com/franks/css/fac_IE.cssValidate">http://www.rocketss.com/franks/css/fac_IE.cssValidate</a><!-- m --> your code. You have many errors. Don't code for IE. It's screwing you up.Taken from a validation of the CSS page...
Errors
URI : <!-- m --><a class="postlink" href="http://www.rocketss.com/franks/css/fac_IE.css">http://www.rocketss.com/franks/css/fac_IE.css</a><!-- m -->

* Line: 5 Context : body

Property behavior doesn't exist : url(csshover.htc)
* Line: 96 Context : #toplevelnav .spacer

Invalid number : width only 0 can be a length. You must put an unit after your number : 100
* Line: 161 Context : div#toplevelnav .menu ul li:hover ul

Invalid number : display Parse Error - display:: block
* Line: 200 Context : #rightside img

Invalid number : padding em is not a padding-left value : 0 0 0 em


Additionally for you PHP page see: <!-- m --><a class="postlink" href="http://validator.w3.org/check?verbose=1&uri=http%3A//www.rocketss.com/franks/sitemap/index2.php">http://validator.w3.org/check?verbose=1 ... index2.php</a><!-- m -->