AK call or fold?

[treeofwisdom7]

ok dont need to flame me cuz i know i suck!! [img]/images/graemlins/grin.gif[/img]

but what do i do here. i think hes on a draw but i dont understand how a guy with a jack or 2 pair can check then flat call and push the turn unless he got 2 pair on turn.

anyway what do you think?

Party Poker No-Limit Hold'em Tourney, Big Blind is t15 (9 handed) converter

MP3 (t1340)
CO (t740)
Button (t740)
SB (t630)
BB (t1400)
UTG (t785)
UTG+1 (t770)
MP1 (t820)
Hero (t775)

Preflop: Hero is MP2 with K[img]/images/graemlins/diamond.gif[/img], A[img]/images/graemlins/club.gif[/img].
<font color="#666666">3 folds</font>, <font color="#CC3333">Hero raises to t45</font>, <font color="#666666">3 folds</font>, SB calls t35, BB calls t30.

Flop: (t132.50) 3[img]/images/graemlins/spade.gif[/img], 8[img]/images/graemlins/spade.gif[/img], J[img]/images/graemlins/heart.gif[/img] <font color="#0000FF">(3 players)</font>
SB checks, BB checks, <font color="#CC3333">Hero bets t100</font>, SB calls t100, BB folds.

Turn: (t332.50) 5[img]/images/graemlins/diamond.gif[/img] <font color="#0000FF">(2 players)</font>
SB checks, <font color="#CC3333">Hero bets t200</font>,SB goes all in, Hero ?.

Final Pot: t532.50