Button is running around 30/20 and is very aggressive. Action in front of him looks weak on this board, so I'm thinking he doesn't have a whole lot here.

Button ($22.29)
SB ($13.50)
Hero ($25.25)
UTG ($15.80)
MP ($22.62)

Preflop: Hero is BB with Q, A.
UTG calls $0.25, MP raises to $1.1, Button calls $1.10, 1 fold, Hero calls $0.85, UTG calls $0.85.

Flop: ($4.50) 5, 3, 2 (4 players)
Hero checks, UTG bets $0.25, MP raises to $0.85, Button raises to $7.3, [color=#CC3333]Hero...

from top of my head - i'd fold cause at the very best, you're a coinflip from what I see here..
of course, you can always come over the top and go AI here.. but meh.. i don't like to do that..

I would 3bet PF though and then lead this flop for PSB .. then, if button goes "raising happy" as he did here, it's a much easier decision I think..

If you're not willing to 3 bet preflop than fold preflop.

with no fold equity, I think I want as much extra money in as possible, .

I call and pray someone else calls/pushes after me. Even if they don't instacall the under potsize turn bet with up to 18 outs.