You might try adopting the jquery code in this module: http://drupal.org/project/hovertip
While that module makes content appear on mouse over, you could change it to merely change the styles (i.e. go from small to large.)
Dave, funnily enough, that's exactly what I'll be choosing. I did fiddle around with Scale most of this morning and just randomly decided not to use it. I moved on to compare hovertips vs. thickbox, and chose yours, mainly because a) it didn't require AJAX (cody's version) and b) it allowed me to use HTML (everyone else's), c) it didn't break the HTML too too horrifically (like BetterTips). I'm not a huge, huge fan of your three shipped defaults (all are either unworkable or break standards in some way), so I'll probably end up tweaking the JS (don't need/want the module) and ripping out all the crap I don't need and writing a new listener, or whatever you call 'em. -- Morbus Iff ( i memorize the words to the porno movies. ) Technical: http://www.oreillynet.com/pub/au/779 Culture: http://www.disobey.com/ and http://www.gamegrene.com/ aim: akaMorbus / skype: morbusiff / icq: 2927491 / jabber.org: morbus