Graceful transition into popup

[dadler]

Rysiek suggests doing a fade-in or zoom-up into the thumbnail zoom plus popup to make it less jarring and "cooler":

"Not a bug but rather an idea: I switched to Opera for a while and I found out, that a new TZP-like extension was developed here: it is called "Imagus" and this has one nice feature- a popping up image does not pop out in a rapid way - on the contrary - it is nicely animated - kind of "growing up". "

[dadler]

Fading in would be difficult in the current implementation since TZP is a separate window, not an image floating in the html doc. For example, jquery-ui doesn't seem to work with a separate xul window like this. But the "growing up" approach may still be doable.