I haven't posted anything remotely technical in a while, but I thought this would be a good one.
I'm working on chopping a comp to html at work, and while the design looks nice, it requires a few transparent PNGs. Of course Firefox renders them correctly, as does IE7. Besides the tabs, I'd say that's the biggest improvement in IE from 6 to 7. IE 5.5+ pretty much doesn't work.
Though I just found this article on mouseovers, I came up with a cute little fix.
Click to view code
If I load each image and immediately hide the hover, the rollover will work by switching the visibility. Using prototype it's trivial to toggle both.
And I do understand this isn't the best way to do it. But hey, if I could have gotten ANY of the other's to work... I would have used them.