I fixed the bug with the "double down" feature in blackjack and also added better buttons. The original post has been updated. Clear your browser cache and download it again for the new version.
The problem was that if you clicked the "double" button and did not have enough money remaining to cover the doubled bet it would just lock up. Now if you don't have enough money to cover the double, the button simply won't do anything. Otherwise it will work as intended.
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