What's the most similar JavaScript shortcut to the one on Apple's website? (link provided)

If you click on:

http://store.apple.com/us/product/MAC_OS_X_SNGL

And then click on "Find out which version you are using" :

Apple website http://imgbag.com/josh/joshx/StackOverflow/AppleWebsite.jpg

I appreciate they probably paid to set it up like a king, but I can't find one that comes close in terms of how it pops up and style, etc.