Anyone remember this?

Someone posted this link ages ago and said how it was done, and now I can't figure it out, anyone remember or know?

http://www.caveofmagic.com/zndex.html ]

Forums: The Bar,

Oh wait. *Smacks head.* As soon as I posted this I figured it out.

...so um, how does it work?

Write down all the cards in the first lot. Compare them to the 2nd lot.

Hint 1. When it says "Simeon has selected your card and has removed it from the pile," maybe that's not all he's removed.

Hint 2. Try picking two or three cards instead of just one.