Sorry ecntrc... i have no experience with what your are asking...
Any time i've made multilingual websites, i leave it up to the user to select their appropriate language... I usually have a "english | french" option which branches to the appropriate files.
This link might help you do it autmoatically though:
W3C I18N FAQ: Apache MultiViews language negotiation set up
Sorry, it's all I could find that looked useful... i don't think its a picnic.
Mike.