Best approach to make javadoc tag 'alive'

I would like to make a few javadoc tags respond to a mouse-over and I'm
wondering what the best approach to do that would be.

For example, given:
/**

• @see FooBar

*/

I would like to be able to pop up a little html hint-like window when I
hover over "FooBar" (possibly similar to what you get when you hover over
folded code, or even the quick-javadoc one).

Another possibility would be to add a little gutter icon; the "best
approach" question for that holds too.

Ideas?

Thanks,

Vince.