>I see that a few styles are not supported by FireFox.

Michel,

I notice the A.Menu:link, A.Menu:visited, and A.Menu:hover styles defined in 'stylesheet.css' used by IE do not appear in 'Netscape.css' used by Firefox. These appear to be the styles assigned to the hyperlinks in the left nav area of the main page. Maybe this has something to do with the problem.

-Rick