AKo beat by A7o

Hello All,
I was doing quite well on the 25NL until this hand last night. Please critique my play, just don't call me an idiot. I already know that.

I just sat down to this table, and I had only seen a couple hands, so I didn't really have any reads.

Party Poker (8 handed) converter

Preflop: Hero is BB with A[img]/images/graemlins/diamond.gif[/img], K[img]/images/graemlins/spade.gif[/img].
MP2 Bets 8BB, <font color="#666666">6 folds</font> I call(Should I have raised?)

Flop: A[img]/images/graemlins/heart.gif[/img], 4[img]/images/graemlins/heart.gif[/img], 3[img]/images/graemlins/heart.gif[/img] <font color="#0000FF">(2 players)</font>
.
I bet the pot, he calls

Turn: 6[img]/images/graemlins/spade.gif[/img] <font color="#0000FF">(2 players)</font>
.
I bet the pot, MP2 Calls

River: 7[img]/images/graemlins/diamond.gif[/img] <font color="#0000FF">(2 players)</font>

I bet 22.65 (All-In), MP2 calls 18.35 (All-In).

MP2 Shows A[img]/images/graemlins/club.gif[/img], 7[img]/images/graemlins/heart.gif[/img]

I was up $50 for the night until that hand, good thing he only had $18.35 . . .