Tetris in Javascript!

I'm fiddling around with Javascript, and managed to build a Tetris protoype. I like that There aren't actually any tetris blocks on screen- no display objects - but rather I maniplate the bg colors to create the blocks. Feel free to download the code, and let me know what you think.

Play Tetris
Donwload Source code

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Thoughts on HTML5, a Flash Developers hopeless rant

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