targeting frames in chat script

I started with the "A MySQL Driven Chat " article and progressed on from there in an attempt to integrate a chat with my bulletin board.

I have uploaded a copy of the basic starting script and its output to the web at: URL

I have tried to syntax highlight it as best I can.

Things are going ok login and log out with database references now work, but now I want to add a third frame to store a list of users currently in chat.

I can add the frame (called usernames) and using javascript document.write, I can even write to it. The problem is, the refresh command continually repeats the javascript usernames and so it is rather a useless way of doing it.

I am a newbie in both PHP and JS, but could someone please explain in a simply way how the script given in the article above puts each bit of code in whichever frame. From there I am sure I can work out the rest. But for the life of me I cannot see why the input text and button is in the bottom frame and the posts are in the top frame even though obviously they are.

I have searched the net looking for "targeting frames" with php but have got nowhere fast. Even the php manual hardly mentions frames.

Please help before I go crazy

Thanks
Dave

well, each frame has it's own page as a source. this isn't specific to what you're doing but standard. you just write a php file, usersOnline.php, that lists out online users from the db...

simply put a <meta http-equiv="refresh" content="5"> tag in the html for that page, and it will refresh the list every 5 seconds.

if that doesn't help, give me some more specific info