Generally a good fold with JJ or too weak?

I am fairly new at the table when this hand occurs. The way I see it I make the worst mistake by not reraising a good amount pre-flop. The small bet into the PF-raiser scares me, making me think he has 33/66/77 or perhaps 67 since he limped and the called the raise. However, I decide to checkraise and let go of the hand if called. That is exactly what happends, and therefore I check-fold the turn and Carl shows me that he was making an...interesting...play with 79o...Know that Carl was a fish calling that checkraise with 79, I would have bet the turn, however I did not have any read on him when the hand was played. Any opinions/suggestions?

Game #738817044: Texas Hold'em No Limit ($0.50/$1) - 2005/07/28 - 12:17:08 (ET)
Table "Steelton" Seat 5 is the button.
Seat 1: Gran27093 ($49.10 in chips)
Seat 2: G-Unit25 ($23 in chips)
Seat 3: hexecutor ($56 in chips)
Seat 4: Dazphelps ($50.96 in chips)
Seat 5: Lanc02061 ($158.90 in chips)
Seat 6: mbman1 ($158 in chips)
Seat 7: Frank004 ($111.25 in chips)
Seat 8: fgur ($81.44 in chips)
Seat 9: Daane ($139.75 in chips)
Seat 10: Carl23092 ($47.45 in chips)
mbman1: posts small blind $0.50
Frank004: posts big blind $1
----- HOLE CARDS -----
dealt to mbman1 [Jc Jh]
fgur: folds
Daane: folds
Carl23092: calls $1
Gran27093: calls $1
G-Unit25: folds
hexecutor: raises to $3
Dazphelps: folds
Lanc02061: folds
mbman1: calls $2.50
Frank004: folds
Carl23092: calls $2
Gran27093: calls $2
----- FLOP ----- [7h 6c 3c]
mbman1: checks
Carl23092: bets $3
Gran27093: calls $3
hexecutor: calls $3
mbman1: raises to $12
Carl23092: calls $9
Gran27093: folds
hexecutor: folds
----- TURN ----- [7h 6c 3c][2d]
mbman1: checks
Carl23092: bets $32.45 and is all-in
mbman1: folds
Returned uncalled bets $32.45 to Carl23092
----- SHOW DOWN -----
Carl23092: shows [7c 9s] (A Pair of Sevens, Nine high)
Carl23092 collected $41 from Main pot
----- SUMMARY -----
Total pot $43 Main pot $41 Rake $2
Board [7h 6c 3c 2d]
Seat 1: Gran27093 folded on the Flop
Seat 2: G-Unit25 folded before Flop (didn't bet)
Seat 3: hexecutor folded on the Flop
Seat 4: Dazphelps folded before Flop (didn't bet)
Seat 5: Lanc02061 (button) folded before Flop (didn't bet)
Seat 6: mbman1 (small blind) folded on the Turn
Seat 7: Frank004 (big blind) folded before Flop (didn't bet)
Seat 8: fgur folded before Flop (didn't bet)
Seat 9: Daane folded before Flop (didn't bet)
Seat 10: Carl23092 showed [7c 9s] and won ($41) with A Pair of Sevens, Nine high
****HAND ENDS****