redirect if style chosen to subdomain

[jcr]

Hello guys!

I want to redirect my users if they choose a style to a subdomain. I cannot just ad a redirect in the header, because if would cause the page to reload and reload when they come to the subdomain.

The reason why I do this is because I have set up a totally stripped forum at a subdomain, which uses the same database as the fullversion site with all hacks installed.

Does anyone have a solution? I want to redirect users to a subdomain but does not want them to redirect if they are already on that subdomain.