Matt's Whois Script - PHP in templates?

[cheZ]

I've currently implementing 'Matts Whois Script' on my site, however in modifying the template files, I discovered that for some reason PHP does not work within the template files? I've tried giving the template an extension of .php but it still doesnt work. The reason i need to use PHP within the template file is so that I can display to the user a price for the available domain depending on the extension they have selected.

Does anyone have a solution for this?