CSS DIV link disabled in FireFox

[MagoDaniel]

Hi to all, I'm new on this group, and I'm italian, so my english is
very bad...
I have an incledible problem with this site: http://www.nikkei-italia.com:
in firefox (and now I will test Google Chrome) all link of the page
are disabled. If you try to browse the site with IE7 you don't find
any problem...

Where is the problem? I've tested the css validator at this link
http://jigsaw.w3.org/css-validator/#validate_by_uri+with_options and
there isn't important problem (I hope), however the site is not
navigable on Firefox.

Can anyone help me, I'm a ASP.NET developer but my css understainding
is very small...

Thanks in advance!

Daniel Grandis, Italy