What do you think of my line with AKs? ($11)

#Game No : 3207395143
***** Hand History for Game 3207395143 *****
NL Texas Hold'em Trny:18309277 Level:5 Blinds (50/100) - Thursday, December 15, 20:43:21 EDT 2005
Table Multi Table(541822) Table #65 (Real Money)
Seat 2 is the button
Total number of players : 10
Seat 1: builder1000 ( $2345 )
Seat 2: ottoleave ( $1685 )
Seat 3: garypokrnuts ( $2175 )
Seat 5: kingjackoff_ ( $755 )
Seat 6: thornsfan ( $4150 )
Seat 7: castanza_g ( $1410 )
Seat 8: juneau1 ( $3985 )
Seat 9: turdfer ( $980 )
Seat 10: smg279 ( $2709 )
Seat 4: pokerbabka ( $4132 )
Trny:18309277 Level:5
Blinds (50/100)
** Dealing down cards **
Dealt to castanza_g [ Ad Kd ]
kingjackoff_ folds.
thornsfan folds.
castanza_g raises [275].
juneau1 folds.
turdfer folds.
smg279 folds.
builder1000 calls [275].
ottoleave folds.
garypokrnuts folds.
pokerbabka calls [175].
** Dealing Flop ** [ Jc, 6d, 9s ] POT: t875
pokerbabka checks.
castanza_g bets [350].
builder1000 calls [350].
pokerbabka folds.
** Dealing Turn ** [ Ac ]POT: t1575
castanza_g checks.
builder1000 bets [500].
castanza_g is all-In [785]
builder1000 calls [285].


What would you do on the turn if you don't improve?