Website needs to have iframe link and start to a specific topic.

I am working on a wbsite that reviews and reports on vintage videogames. For example, I have a description page for Excitebike, and a TV commercial page, and a box and cartridged scan page. I have recently wanted to ad a message board area dedicated to each game reviewed. I copied the url in the url box of IE7 from the excitebike topic page. I placed this into my iframe of my website page for the forum page. It worked with one topic in one page of excite bike. But when I added a second game topic and linked to it The topic iframe of excitebike now shows the new game instead of the excitebike topic.

Is there somewhere I can get a link to each topic to ad to each of my pages dedicated to that topic with out showing other topics in the iframe.I can not really explain this well, so please check my page to see the wrong topic is in the wrong iframe. you may have to surf to other topics to get this to happen, When the parnet excitebike forum page is loaded I want it to always load the relivent Iframe of the topic excitebike.

http://www.1upgame.com/excitebikeUR.html

Help please.
Joshua Carnes
AKA Talmage of www.1upgame.com