KJo - faced ugly turn bet

[crackin]

Party Poker
No Limit Holdem Ring game
Blinds: $0.50/$1
5 players
Converter

Stack sizes:
UTG: $46.56
CO: $118.48
Hero: $77.50
SB: $120
BB: $93.03

Pre-flop: (5 players) Hero is Button with K[img]/images/graemlins/heart.gif[/img] J[img]/images/graemlins/spade.gif[/img]
2 folds, <font color="#cc0000">Hero raises to $4</font>, SB calls, BB calls.

Flop: 5[img]/images/graemlins/diamond.gif[/img] J[img]/images/graemlins/heart.gif[/img] 7[img]/images/graemlins/diamond.gif[/img] ($12, 3 players)
SB checks, BB checks, <font color="#cc0000">Hero bets $9</font>, SB calls, BB calls.

Turn: T[img]/images/graemlins/club.gif[/img] ($39, 3 players)
SB checks, <font color="#cc0000">BB bets $10</font>, <font color="#cc0000">Hero raises to $28</font>, SB folds, BB calls.

River: 7[img]/images/graemlins/spade.gif[/img] ($95, 2 players)
<font color="#cc0000">BB bets $18</font>, Hero calls.

Results:
Final pot: $131

villain unknown. i was not sure if that was a weak probebet to see a cheap river or a weak value bet :S
i decieded to bet because there are alot of cards i don't like to see on the river.
river bet is pot odds call - or should i fold it?
any ideas how to play the hand better?