This is voodoo math. I looked in the rec.puzzles FAQ on deja and all I could find is this:

"Someone has prepared two envelopes containing money. One contains twice as much money as the other. You have decided to pick one envelope, but you can then "prove" that the other envelope contains more money than the one you chose."

"Threads about these and other logical paradoxes tend to go on for a long time and can get nasty as people try to convince each other of the truth of their positions. If you would like to start a thread about a paradox, please read the archive explanation first to see if that clears things up for you. Whether you are reading or posting to one of these threads, remember that there are many logical interpretations that are often equally valid. If there weren't, it wouldn't be a paradox, would it?"

Update: I looked at the url you gave, but I like this one (update: that link now dead AFAICT) better :-) (At least he uses perl...I wonder if he uses taint?)

Update regarding BlueLines's post: I would've bet that there'd be a division by zero somewhere...