Currency convertor finishing help
 

Hi folks,
I don't know how much interest there would be in a currency convertor, but I have written one using Javascript and PHP which automatically gets the latest rates from a European bank.
For the visitors to my forums - who buy DVDs from the US, Canada, Australia and occasionally Hong Kong, it would be a nice feature.
But I only want it to appear in 3 or 4 specific forums.
So what code would I need to put at the top of forumdisplay template (before $forumdisplay[forumslist]) to check the forum ID and if it matches certain numbers, loads in a new templete?

Is this the right way to do it?
Thanks

you'd have to put the code in forumdisplay.php but im not sure where

Ideally below the list of people browsing the forum.
My code is a mixture of PHP, HTML and Javascript. It works perfectly if I require global at the top.
Integrating into the forums is where I'm lost.