2-pair facing river push

[chrismystero]

I'm readless, since this is the first hand I've played, and I've only been at the table 3 hands. My big question is the river decision, however feel free to comment on earlier streets if necessary.

PokerStars No-Limit Hold'em, $0.25 BB (6 handed) Hand History Converter Tool from FlopTurnRiver.com (Format: 2+2 Forums)

UTG ($52.65)
MP ($29.95)
Hero ($25)
Button ($32.65)
SB ($25)
BB ($25)

Preflop: Hero is CO with K[img]/images/graemlins/diamond.gif[/img], T[img]/images/graemlins/diamond.gif[/img].
<font color="#666666">2 folds</font>, <font color="#CC3333">Hero raises to $1</font>, Button calls $1, <font color="#666666">2 folds</font>.

Flop: ($2.35) 8[img]/images/graemlins/diamond.gif[/img], T[img]/images/graemlins/heart.gif[/img], 6[img]/images/graemlins/diamond.gif[/img] <font color="#0000FF">(2 players)</font>
<font color="#CC3333">Hero bets $2</font>, Button calls $2.

Turn: ($6.35) 5[img]/images/graemlins/spade.gif[/img] <font color="#0000FF">(2 players)</font>
<font color="#CC3333">Hero bets $5</font>, Button calls $5.

River: ($16.35) 6[img]/images/graemlins/spade.gif[/img] <font color="#0000FF">(2 players)</font>
Hero checks, <font color="#CC3333">Button bets $17</font>, Hero??