15/30 Bother with this flop?

[bobbyi]

Button is 40/20/1.5 LAG type. Other guys are very passive, moderately loose. Is it worth check-raising here or just give it up?

Party Poker $15/$30 (6 players)

Pre-flop: (6 players) Hero is BB with 3[img]/images/graemlins/heart.gif[/img] 3[img]/images/graemlins/club.gif[/img]
UTG folds, UTG+1 calls, CO calls, <font color="#cc0000">Button raises</font>, SB folds, Hero calls, UTG+1 calls, CO calls.

Flop: 9[img]/images/graemlins/club.gif[/img] 9[img]/images/graemlins/heart.gif[/img] 5[img]/images/graemlins/spade.gif[/img] (8.67SB, 4 players)
Hero checks, UTG+1 checks, CO checks, <font color="#cc0000">Button bets</font>, Hero folds