4/180, What to do with 77 and a Jack on the board.

[Brandonjp13]

PokerStars Tournament, Big Blind is t100 (8 handed) Converter on pregopoker.com

UTG (t5430)
UTG+1 (t1414)
MP1 (t3695)
MP2 (t3063)
CO (t2350)
Button (t1165)
Hero (t1730)
BB (t2563)

Preflop: Hero is in SB with 7[img]/images/graemlins/heart.gif[/img] 7[img]/images/graemlins/club.gif[/img]
<font color="red">UTG raises to t400</font>, <font color="gray">UTG+1 folds</font>, <font color="gray">MP1 folds</font>, <font color="gray">MP2 folds</font>, <font color="gray">CO folds</font>, <font color="gray">Button folds</font>, Hero calls t350, <font color="gray">BB folds</font>

Flop: (t900) J[img]/images/graemlins/heart.gif[/img] 2[img]/images/graemlins/spade.gif[/img] 3[img]/images/graemlins/club.gif[/img] (2 players)
Hero checks, <font color="red">UTG bets t500</font>,

Ok This guy is pretty donkish, Preflop the bet size = hand size. To me the 500 bet just screams CBet with upaired cards but i'd like to know what everyone else thinks he might have and if i should push or fold.