JJ early in FishTank Tourney

[LLKOOLK1]

First level of blinds,and I have my exact starting stack of 2000. Blinds 20/40.Hero is on the button. UTG(2040) limps in for 40, and UTG+1(2000) Raises to 120. Folds to hero on the button with J [img]/images/graemlins/diamond.gif[/img]J [img]/images/graemlins/club.gif[/img].
Any thoughts on rasing, or just calling here?
I decide to procede with caution and smoothcall on the button. UTG calls the raise
Flop: 5 [img]/images/graemlins/club.gif[/img]7 [img]/images/graemlins/heart.gif[/img]6 [img]/images/graemlins/spade.gif[/img]
UTG checks, UTG+1 bets 180
I think this is a clear raise, but I am willing to listen to any other suggestions here.
Hero raises 320 to 500.
UTG moves all in for 1820
UTG+1Folds
Hero...???
I have to assume that I am behind here right? Possibly a set, or even a higher pair than jacks that UTG had limped with? But there are also other possibilities that I could beat, such as 88, which is about the weakest hand I can see making this play.
any thoughts?
-LL