What to do on turn A's up

[Hosehound25]

Four way pot. Villain has played pretty LAG so far into the session. Pretty loose call preflop, but I was pretty certain the guy behind me was gonna call also, so I was getting decent odds. The turn gives me A's and 7's and I check it to the Villain, who shoots off a potsized bet. I was 50/50 on this one, but with a dangerous board I knew it was either a fold/reraise. I was hoping he had AJ or AQ since he checked the flop. What would be your move on the turn, where do you think I stand?

Full Tilt Poker
$0.25/$0.50 No Limit Hold'em Ring Game
6 Players
LegoPoker Hand Converter

<font color="black">Stack Sizes</font>
MP: $38.50
CO: $25.40
BTN: $88.25
SB: $14.15
Hero (BB): $22.15
UTG: $41.15

<font color="black">Preflop:</font> 7[img]/images/graemlins/diamond.gif[/img] A[img]/images/graemlins/diamond.gif[/img] ($0.75, 6 players)
UTG calls $0.50, <font color="red">MP raises to $2.25</font>, CO folds, BTN folds, SB calls $2, Hero calls $1.75, UTG calls $1.75

<font color="black">Flop:</font> 7[img]/images/graemlins/spade.gif[/img] K[img]/images/graemlins/spade.gif[/img] T[img]/images/graemlins/club.gif[/img] ($9, 4 players)
SB checks, Hero checks, UTG checks, MP checks

<font color="black">Turn:</font> 7[img]/images/graemlins/spade.gif[/img] K[img]/images/graemlins/spade.gif[/img] T[img]/images/graemlins/club.gif[/img] [A[img]/images/graemlins/club.gif[/img]] ($9, 4 players)
SB checks, Hero checks, UTG checks, <font color="red">MP bets $9</font>, SB folds, <font color="red">Hero raises all in to $20.40</font>, UTG folds, MP calls $11.40

<font color="black">River:</font> 7[img]/images/graemlins/spade.gif[/img] K[img]/images/graemlins/spade.gif[/img] T[img]/images/graemlins/club.gif[/img] A[img]/images/graemlins/club.gif[/img] [8[img]/images/graemlins/heart.gif[/img]] ($49.8, 2 players)
No action