Bad concept
the pedobear and the photos in this flash are quite different, so it's no problem spotting him in your bad quality pics, even without the tab key.
I can advise you to make the pedobear into a movieclip, not a button. And then use onMouseDown script which checks mouse position whether it hits the pedobear movieclip or not.
That would 1) Disable hand cursor over buttons easily, 2) Disable all purpose of the Tab key.
And you need to be more creative on Puzzle-Difference games, like finding a "true" pedobear in a picture with several pedobears in it, or something like that. But it doesn't matter because making flash when you're bored is a bad idea overall, but this one turned out pretty funny