Dear Sir/Madam,
Presumably when you say 'action script' you mean the main script, rather than ActionScript which is a separate language and hopefully not what you want here. The chatrooms would be built with php-MySql and Ajax and the various functions users expect in Chat are easily provided - block users, mute, scroll back, check User's Profile, admin rights to block/eject troublemakers, etc, etc. You only need to specify a feature and we can provide it; we have a list of forty or so functions, including private chats and logging of chat for security purposes(these files would be accessible only by yourselves (not by our time) for reasons of user privacy/legality. Smileys or user avatars would of course be included. We would also provide summaries of rooms - how many users, lists of users in that chatroom etc. We can ban swearwords/rude language etc. Other than that, we can design a very attractive interface to fit in with the rest of your site.
We are actually designing a chat for another client at the moment so
your concerns happen to be at the forefront of our minds. Hence the quick turnaround time.
We very much hope to hear from you,
Yours sincerely,
Clean Coders