Two pair vs. 4 flush board

[Macint0sh]

Party Poker 0.5/1 Hold'em (10 handed) converter

Preflop: Hero is CO with A[img]/images/graemlins/diamond.gif[/img], 7[img]/images/graemlins/diamond.gif[/img].
<font color="#666666">4 folds</font>, MP2 calls, <font color="#666666">1 fold</font>, Hero calls, Button calls, SB completes, BB checks.

Flop: (5 SB) A[img]/images/graemlins/heart.gif[/img], 6[img]/images/graemlins/heart.gif[/img], 7[img]/images/graemlins/spade.gif[/img] <font color="#0000FF">(5 players)</font>
<font color="#CC3333">SB bets</font>, BB calls, MP2 calls, <font color="#CC3333">Hero raises</font>, Button folds, SB calls, BB calls, MP2 calls.

Turn: (6.50 BB) 9[img]/images/graemlins/heart.gif[/img] <font color="#0000FF">(4 players)</font>
<font color="#CC3333">SB bets</font>, BB folds, MP2 calls, Hero calls.

River: (9.50 BB) 3[img]/images/graemlins/heart.gif[/img] <font color="#0000FF">(3 players)</font>
<font color="#CC3333">SB bets</font>, MP2 folds, Hero calls.

Final Pot: 11.50 BB

Table has been a little wild, and I suspect that the villain is steaming. Naturally, the turn has me worried, but I don't really think he has the flush. Now, the river has me tearing down my wall because I've already been beaten by a four to the flush board twice today after flopping two pair of better, but I feel the pot is too big to lay down my two pair. I also think there's an outside chance my might show me a black 23o or something.