Shoutbox problems

[GettinBetter]

Hiya people,
Have read a few posts about simple shoutboxes (and how easy they are ) but I'm having trouble.
I have made a form using iframes, and the messages are shown in the top iframe, with the name and message being posted from the lower iframe.

I have three files a config.php (read once), shoutbox.php, and post.html

The shoutbox.php uses the the config.php to access the DB, and send the messages to the main window, and the post.html produces the text entry forms in the lower frame.

It was working fine when it was all in one iframe, but not now that I've modified it.

I think its not posting the variables from the post.html to shoutbox.php

Would appreciate any suggestions.