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These kinds of designs often work badly with flash, as can be seen by the flash ad on the page: http://i.imgur.com/qycS8.png

(flash in most (all?) browsers appears on top of even html regardless of specific css rules)

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For the record, Flash will respect z-index if you set the wmode param.

http://www.communitymx.com/content/article.cfm?cid=e5141

If I remember correctly, setting the wmode param slows down flash performance significantly. I also remember it having significant trouble in opera. However, it's possible that these issues are now fixed in the newer browsers, but I'm pretty sure that older browsers still experience them.

Def some quirks back in the day (I think FF on Linux still doesn't even listen to the wmode param, iirc) but I think modern browsers deal with wmode better now.

There's an option for window mode in the HTML used to embed flash. You can set it to behave nicely, but (surprise!) most advertisers don't.

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