This is a semantic tab box with some fancy animations.
Tab 2
It's super exciting.
Tab 3
It relies on jQuery, and it can only be a fixed height due to the absolute positioning, but whatever. That's the price you're paying for sensible markup I guess.
Check out my multiple paragraphs.
Tab 1
This is the same thing, but vertical.
Tab 2
Same caveats as before, but I'll be damned if it isn't pretty.