I knew there was a better solution out there, like here and here. I like Adrian Holovaty's one better, because it makes the difference between internal and external links (OTOH), it stores your preference in a cookie (although I have to figure out how to make it work with MT), and it makes the entire option text clickable (smart). I wrote to Adrian and he gave me permission to reuse his code, thank you Adrian.
Now, you have choice, isn't that cool? (oh là, je m'américanise à vue d'oeuil)