An easy way to do it is to learn by viewing examples(and doing). And the best examples are short codes. js1k.com has lots of games and programs made with javascript, and they are all 1024 bytes or less.
Edit:
techn0teen wrote:
I want it to be in flash since it seems like the most popular medium. No Java! (Applets have a hard time loading on the school's computers).
ops.. I didn't read the question properly.
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