One major problem...
In Blackjack, aces can be either 1 or 11. You coded it so they can only be 11. I got a 4+3+5+A on the first deal and busted. It should have been 13. Fix that problem, and add some sound and maybe some animated cards (i.e. the cards fly off the deck and onto the table or something like that) and this would be a pretty good game.