what u see is the html code generated by cms. i copy&paste the source code into dreamweaver.
your tables are not at the same width 4 your headcontent / leftcontent and maincontent.
thats why ure layout breaks out in different browsers.
Looks fine to me - 18 October - Firefox PC. Rollovers and links work. Would be useful to change the page content slightly to check the correct pages are being loaded.