20-40 in the Pit at Taj: Who finds a fold on the turn?

[Jeffage]

Playing in an excellent must-move 20 game in the pit at the back of the Taj poker room. Very loose game. I have A [img]/images/graemlins/spade.gif[/img]J [img]/images/graemlins/diamond.gif[/img] in the big blind. Two players limp and the button raises. The button seems to play a lot of hands and seems to like raising connectors. SB folds, I call and the limpers call. The flop comes A [img]/images/graemlins/heart.gif[/img]3 [img]/images/graemlins/heart.gif[/img]7 [img]/images/graemlins/club.gif[/img]. I check, both limpers check and the button bets. I raise. First limper folds and now the second limper comes to life and makes it three bets. The button calls 2 cold. I call. The turn is the 9 [img]/images/graemlins/spade.gif[/img]. I check, limper bets, button calls. What's your play here? Call, fold? Is it close? The check-three bet seems like it has to be a set and button could have an overpair. I'm getting about 8.5-1 on the turn.

Jeff