Linking to language version from external page

hi,
i am using vanilla 2 at http://community.netigate.net/answers/ and got the multilanguage plugin working. in the footer you can change the languages.
I want to use a blog at http://community.netigate.net/ and want to link directly to the right language like via http://community.netigate.net/answers/?locale=en-CA or something similar.
is there a way to do it? any ideas? maybe with a cookie based solution?
the benefit for the user would be that he wouldnt have to change the language again on each site.
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