Showing a perl flat file based forum within an iframe when searched from an engine.

A little information:

server: linux
homepage: www.w8k8.com
forum page (that contains the perl forum in an iframe): www.w8k8.com/forum.html
perl forum (directly): www.w8k8.com/cgi-bin/forum/Blah.pl

What should happen:

My site contains a Perl forum, using javascript i can link in and out of it while keeping it in its iframe on the page /forum.html, and i can link to certain pages within the forum, an example:

www.w8k8.com/index.html has a link like this in it:

<a href=forum.html?ifsrc=/cgi-bin/forum/Blah.pl?b-gb>General Discussion </a>

using the code on www.w8k8.com/forum.html:

function getSource()
{
   ifsrc=location.search.substring(1)
   ifsrc=ifsrc.substring(6,ifsrc.length)
   document.getElementById('iframe1').src = ifsrc
}

It loads everything as it should be, maybe it would be best to look at the site if I've confused you already!

The Problem:

Say someone searches "w8k8 general discussion" from Google, they will get a link to the page www.w8k8.com/cgi-bin/forum/Blah.pl?b-gb, which if you go to you can see isn't within the iframe, i want them to be at this page <a href=forum.html?ifsrc=/cgi-bin/forum/Blah.pl?b-gb> but obviously you cant edit that on the Google side so my problem cannot be fixed with the previous solution.

Overview, what i would like to happen:

Google link to any forum page

before perl file loads user is redirected to the relevent perl subsection/page BUT now the page is within an iframe on forum.html.

I have tried to be as coherent as possible, please message me back if you are unsure what i am trying to do.

many thanks

Steve