Will this work if you already have 123flashchat? I have 123flashchat on my forum.

Of course. 123 Web Messenger can be fully integrated with 123 Flash Chat. Then the chat room can be also shown on the Facebook like chat bar.

You can apply a free one to try:
http://www.123flashchat.com/free-web-messenger.html

It seems like the formating could be applied to other free chat scripts.

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is there an option to have this running off my own server rather then theres?

Yes you have the option of running it on your own server. I think its only valid if you purchase the service though. Not sure about the free mod.

Thank you very much, Jabong82!

Sure! We also offers Web Messenger software license and you can run it on your own server.
There is free demo version to try (10 concurrent users limited):
Download 123 Web Messenger Chat Software Free Version!:)

FYI, 123 Web Messenger User Manual

how can i configure wm_config.php file ???

I know you found these words [configure wm_config.php file] at the ReadMe file.

When you download and decompress that .zip, you will find four files. Please open this file: wm_config.php, and you will find the detailed configuration information in it.

123 Web Messenger provides both free version and charged version for you. And you can also host it by yourself or on our side.

Of course, there are some limitation with the free version.

Free chat hosting: http://www.123flashchat.com/free-flash-chat.html

Free chat server software: http://www.123flashchat.com/download.html

So if you need to host the chat server on your website, you need to download that Free chat server software and install it in your server.