NL25 TPTK facing overbet on flop

[shooot@04]

Villain just sat down, no reads

Full Tilt No-Limit Hold'em, $0.25 BB (9 handed) Full Tilt Converter Tool from FlopTurnRiver.com (Format: 2+2 Forums)

CO ($30.95)
Button ($17.85)
SB ($20.75)
BB ($22.40)
UTG ($5.05)
UTG+1 ($24.50)
MP1 ($4)
MP2 ($12.10)
Hero ($28.25)

Preflop: Hero is MP3 with A[img]/images/graemlins/diamond.gif[/img], Q[img]/images/graemlins/spade.gif[/img].
<font color="#666666">2 folds</font>, MP1 calls $0.25, <font color="#CC3333">MP2 raises to $1.25</font>, Hero calls $1.25, <font color="#666666">4 folds</font>, MP1 folds.

Flop: ($3.10) 9[img]/images/graemlins/heart.gif[/img], 7[img]/images/graemlins/diamond.gif[/img], Q[img]/images/graemlins/diamond.gif[/img] <font color="#0000FF">(2 players)</font>
<font color="#CC3333">MP2 bets $4</font>, <font color="#CC3333">Hero ???

I just called on the preflop b/cuz of position. Is this just a fold or should I put him all-in? Should I have repoped him pre?