Boarderline maniac goes allin what to do

[PokeHer]

Party Poker No-Limit Hold'em, $ BB (6 max, 6 handed) converter

Button ($30.8)
Hero ($164.14)
BB ($21.23)
UTG ($48.5)
MP ($26.65)
CO ($76.97)

CO is not exactly a maniac, but he is close to being one. At worst he's got a set, in which case, im still about 43% to win. if hes got top pair or an overpair, im 55%. Is this an easy call? i think so, but im a limit player turned NL, so im not sure if this is right, though the math justifies it


Preflop: Hero is SB with T[img]/images/graemlins/heart.gif[/img], 8[img]/images/graemlins/heart.gif[/img]. Hero posts a blind of $0.25.
UTG calls $0.50, MP calls $0.50, CO calls $0.50, <font color="#666666">1 fold</font>, Hero (poster) completes, BB checks.

Flop: ($2.50) Q[img]/images/graemlins/heart.gif[/img], 9[img]/images/graemlins/heart.gif[/img], 6[img]/images/graemlins/spade.gif[/img] <font color="#0000FF">(5 players)</font>
<font color="#CC3333">Hero bets $2</font>, BB calls $2, UTG calls $2, MP calls $2, CO calls $76.47 (All-In), Hero calls $74.47, BB folds, UTG folds, MP folds.