So was the problem something to do with the "poppy" CSS not being applied to the "naked" <img> tag, but only when that <img> was enclosed in a div with that same id? -- A pure CSS problem, in other words?
That would imply some change in CSS inheritance behavior with the Opera 10.x release.
Curious because I always seem to be banging my head against strange CSS problems. I figure that as soon as I finally learn "the one true way" to do CSS properly --having come into the CSS game relatively late-- then I'll cease to continue running into these problems -- Well, I'm hopeful, anyway. :)