Setting language according to domain

Hi,

I got great tips here on setting the $base_url according to the server host:
http://punbb.informer.com/forums/topic/ … o-domains/

What I also need to do is set the interface language according to the domain. Where should I go changing this, any ideas?

BTW, I love the light nature of PunBB, after 8 years dealing with phpBB.

Eoin