I just bought the pro version an have a little (I hope) question

I have an online shop at maindomain.com
this shop is already multilanguage, translated by hand. So this should stay like this. It also uses a subdir for each language.
I have a blog though, installed in /blog, on which I'd like to use gtranslate. Each language should have his own domain.
How can I install gtranslate to work only on this blog, and leave my shop alone?
If I put the redirect stuff in .htaccess in my main directory, I'm getting loop errors.
Hope you can help! Thanks in advance!