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if AS3 were based on AS2 i would say yes go to it but FOR GODS SAKE stay with AS2 if you know nothing of AS3 as Magical-Zorse said Good games still are being made in AS2, you might want to get AS3 for better physics engines or 3D engines, but i think its not worth it
i still use it but i have no ideas to run with so i have nothing to make
well i have several ideas now but before i had none
well yea you do because why would you go get NG ads for a flash game/movie thats not even going on newgrounds :)
you might as well go get your own account with CPMSTAR and put on your own ads to your flash
everything you view is still being loaded off the server so even if they did it in flash it still goes to the server and loads the flash but with flash it doesnt look as proffessional
another reason is flash cant be indexed as well as JS, it may be similar but its highly likely that if it were flash i wouldnt be able to search for NG artwork on google
you can find it easier on google but i dont think that tom has set it up so each piece of artwork is indexable primarily because of copyright or because he cant be bothered to yet
so you get my point as in flash cannot be indexed as well and does not look as proffessional as JS