You're getting great odds
to call. Pot is somewhere around 27$ and you have to call 5$ (a very small bet, but I guess that's because the button is not a very bright player. Could mean a monster though). You have to be ahead a very small percentage of times to make this call profitable.
It's not unlikely you're ahead of both players here; if the button is that loose and likes to bluff, you're very likely ahead of him, and the SB can very easily have a weaker J. I say call the turn and check/call the river if it's not a very big bet and if the SB gets rid of his hand after the button bets, which he will most of the time he's checked to.
Oh, and I agree that we should think about 3 betting this preflop and sandwich in the callers, but a call is a good move if you can outplay the rest of the players postflop.