Show furigana over kanji?

[birtles]

From AMO:

One feature I wish it had is to display furigana over kanji when on hover.

I've deliberately avoided doing this in the past since I'm not sure of a really clean way to do this. For example, if the user hovers over 牧場 do we show the ぼくじょう reading or the まきば reading? Or do we show the kanji twice?

(I think I recall this topic being discussed in the context of WWWJDIC too with Jim Breen saying he too prefers to show the kanji and kana separately.)