bb special... or not?

[stu-unger]

read on villain is that he was nothing special. i hadnt seen him get out of line much, but he seemed to be the average donk that liked TP a whole lot more than he should. his turn bet froze me up... what's your line?
50 nl 6-max
effective stack 40
dealt to hero J [img]/images/graemlins/diamond.gif[/img]4 [img]/images/graemlins/club.gif[/img] in BB

pre-flop: folded around to sb who completes, i check.

flop (1): Q [img]/images/graemlins/diamond.gif[/img]J [img]/images/graemlins/club.gif[/img]4 [img]/images/graemlins/heart.gif[/img]
villain bets 1, hero raises to 4, villain calls.

turn (9):7 [img]/images/graemlins/spade.gif[/img]
villain bets 5, hero...

whats your plan from here on out?