First hand post, small/middle pair

[luckydog]

First hand post so fire away.
I'm never sure what to do with pairs in this range.
Was I right to keep betting this one with no raises?

Luckydog

Paradise Poker 0.25/0.50 Hold'em (8 handed) converter

Preflop: Hero is BB with 6[img]/images/graemlins/club.gif[/img], 6[img]/images/graemlins/spade.gif[/img].
UTG folds, UTG+1 folds, MP1 calls, MP2 folds, CO calls, Button folds, SB completes, Hero checks.

Flop: (4 SB) T[img]/images/graemlins/club.gif[/img], J[img]/images/graemlins/diamond.gif[/img], J[img]/images/graemlins/spade.gif[/img] <font color="blue">(4 players)</font>
SB checks, <font color="CC3333">Hero bets</font>, MP1 calls, CO calls, SB folds.

Turn: (3.50 BB) 9[img]/images/graemlins/spade.gif[/img] <font color="blue">(3 players)</font>
<font color="CC3333">Hero bets</font>, MP1 calls, CO calls.

River: (6.50 BB) A[img]/images/graemlins/club.gif[/img] <font color="blue">(3 players)</font>
Hero checks, <font color="CC3333">MP1 bets</font>, CO calls, Hero calls.

Final Pot: 9.50 BB