what is the right play here? 

Full Tilt Poker Game #20354734443: The $200K Double Deuce (154487209), Table 370 – 40/80 – No Limit Hold’em – 17:29:59 ET – 2010/04/25
Seat 1: jakuzma (8,081)
Seat 2: berghar (3,865)
Seat 3: ChubbyBubby (3,105)
Seat 4: Philthy McSpew (1,830)
Seat 5: DiXChapoLa (5,810)
Seat 6: Ksight3 (3,280)
Seat 7: lexgrinder (3,029)
Seat 8: uli_kunko (2,931)
Seat 9: gillyred (3,139)
Ksight3 posts the small blind of 40
lexgrinder posts the big blind of 80
The button is in seat #5
*** HOLE CARDS ***
Dealt to lexgrinder [3d 4s]
uli_kunko folds
gillyred folds
jakuzma has 15 seconds left to act
jakuzma calls 80
berghar folds
ChubbyBubby calls 80
Philthy McSpew folds
DiXChapoLa has 15 seconds left to act
DiXChapoLa folds
Ksight3 calls 40
lexgrinder checks
*** FLOP *** [4h 3h Ac]
Ksight3 checks
lexgrinder checks
jakuzma bets 320
ChubbyBubby folds
Ksight3 folds
lexgrinder calls 320
*** TURN *** [4h 3h Ac] [Kc]
lexgrinder checks
jakuzma bets 960
lexgrinder raises to 1,920
jakuzma calls 960
*** RIVER *** [4h 3h Ac Kc] [7c]
lexgrinder bets 709, and is all in
jakuzma calls 709
*** SHOW DOWN ***
lexgrinder shows [3d 4s] two pair, Fours and Threes
jakuzma shows [Jc 9c] a flush, Ace high
jakuzma wins the pot (6,218) with a flush, Ace high
*** SUMMARY ***
Total pot 6,218 | Rake 0
Board: [4h 3h Ac Kc 7c]
Seat 1: jakuzma showed [Jc 9c] and won (6,218) with a flush, Ace high
Seat 2: berghar didn’t bet (folded)
Seat 3: ChubbyBubby folded on the Flop
Seat 4: Philthy McSpew didn’t bet (folded)
Seat 5: DiXChapoLa (button) didn’t bet (folded)
Seat 6: Ksight3 (small blind) folded on the Flop
Seat 7: lexgrinder (big blind) showed [3d 4s] and lost with two pair, Fours and Threes
Seat 8: uli_kunko didn’t bet (folded)
Seat 9: gillyred didn’t bet (folded)