Subdomain template link

[Thomvdberg]

Hello Joomla!

I am creating a website where people can buy templates, so i am looking for a way to showcase these templates in a nice way.
There are a lot of sites out there that use a subdomain like demo.arandomsite.com, i want to do something similar, BUT.. all these sites have a template selection at the top, i want to do this differently by having the user press a link on the "main"domain.. and have it redirect them to the demo subdomain with the template they have selected, since there are a few templates they can choose from.

In short, is there a php line or something that allows me to redirect users to my subdomain with the template they have chosen?

Cheers
Thom van den Berg