http://www.contrib.andrew.cmu.edu/~jcreed/gerda.html
Don't bother trying to click on any of the links --- the only point of them is to have title attributes so that hovering over them gives (some approximation of) an english gloss of a word. I'm sure there is some far cleaner CSSy way of accomplishing that much better, but I don't really care right now.
I think adam's original idea, if I remember correctly, was doing it as a proxy or something. I think that would be The Way, rather than a pure js approach.