Also, I am looking for someone to convert the JavaScript code into a FireFox compatible form. I've tried doing this myself, being fed up with only IE compatibility, but it ended up being a total disaster. Some remnants of my attempts are still there, so there is *some* basis to work from.
If you are interested, please PM me (or post a message here)!
System requirements for BETA testers:
-Apache 2 server with PHP 4 installed.
-PHP XML support needed.
Here are a few screenshots:

The login screen.

The main screen.

Editing your profile.

The admin menu on the main screen.

User moderation screen.

Various user options, such as blocking, adding to buddy-list, and seeing if they've got "Stealth" on, which makes them appear offline.

A one-man chat session...
Here's a complete feature list:
- XML database
- View users online/offline/buddies in main window.
- Stealth mode allows user to seem offline (can be seen by users with higher level).
- Online stati: Online, Be Right Back, Away, Busy.
- Automatic switching of online status to Away after user-defined time.
- Edit your preferences
- Edit your account information
- Post styling via BB code (smilies, colors, styles, etc.)
- Create/Edit/View buddy list
- View users online
- Start private conversations
- Automatically joins 2 or more private conversations if they all end up having the same participants
- Invite/kick users to/from private conversations
- Info messages - moderation rights, chatroom read-only, etc.
- Secure password - stored as md5 hash
- Edit your profile
- Copy posts to clipboard
- Change font-size of posts (small, medium, large)
- [Super-/Mod/Admin] Promote users to any level below current user\'s level (ie: Admin cannot promote other user to admin, SuperAdmin must do this). Degrade any user whose level is lower than current user\'s level.
- [Mod] Moderate users
- [Mod] Soft-delete posts
- [Mod] Moderate assigned chatrooms
- [SuperMod] Assign/edit moderation rights for each user on a per-chatroom basis
- [SuperMod] Moderate any chatroom (except for admin chatrooms)
- [SuperMod] Delete posts one by one (not soft-deleting anymore)
- [Admin] Create/Edit/Delete individual chatrooms
- [Admin] Create chatrooms allowing only certain users
- [Admin] Create chatrooms allowing only certain levels (regular, mod, supermod, admin, superadmin)
- [Admin] Create/Edit/Delete user accounts
- [Admin] Mass delete posts
- [Admin] Prune posts/users
- [Admin] Merge chatrooms
- [SuperAdmin] Undeletable account (unbannable) unless someone else has access to the filesystem
- May kick the user after some time, but this shouldn't happen. I'm still working on the session validation functions.
- Loading the main interface takes up to a few seconds.
Tom
PS: I hope this is the right forum. If not, bring on the inevitable, mods...