Tricky spot with AK - 2/4 NL

[VitoT]

villian is very loose player, his calling range is very wide, but i'm not sure about raising range, but in general he is very loose, and might also float with nothing, he knows me as a laggy regular, and not getting involved in many pots with me.

Full Tilt Poker, $2/$4 NL Hold'em Cash Game, 6 Players

UTG: $671.25
MP: $423.50
CO: $227.95
BTN: $843.20
SB: $398
Hero (BB): $401.35

Pre-Flop: A [img]/images/graemlins/diamond.gif[/img]K [img]/images/graemlins/club.gif[/img] dealt to Hero (BB)
UTG raises to $14, 4 folds, Hero raises to $52

Flop: ($106) 10 [img]/images/graemlins/diamond.gif[/img]7 [img]/images/graemlins/heart.gif[/img]7 [img]/images/graemlins/club.gif[/img] (2 Players)
Hero checks, UTG bets $25, Hero calls

Turn: ($156) A [img]/images/graemlins/heart.gif[/img](2 Players)
Hero checks, UTG bets $78, Hero calls

River: ($312) 3 [img]/images/graemlins/spade.gif[/img] (2 Players)
Hero checks, UTG bets $156, Hero ?

comments on all streets are welcome.

thanx,