This can't be done for a couple of reasons I just looked into it. One MFC doesn't have an API. Second the chat is using flash, and that can't be controlled with javascript or any outside program. So anyone claiming to do this would be lying.
It is most certainly possible... (
I'm not lying )
The chat is handled via flash yes, but it is inserted into the html dom and you can extract the information from that via a variety of methods.
At the link above is a screen recording of my test program extracting the chats via C#