Spaceports.com is one of the very few free-hosting sites that provides PHP and perl CGI scripting, as well as MySQL database support. If you email me, I can get you set up with chat scripts.
Ah, it wasn’t clear from your OP that you had a site. Contact your ISP and find out if the provide at least Perl 4.0 support. If they do, you can host the chat software on your own webspace directly. If not, you can set up an account on spaceports and link to it from your main site. Or you can move your whole site to the spaceports servers, which might be a good way to go, as spaceports has requirements about keeping an active site with at least two webpages in order to keep your account active.