Check/Call or Bet/Fold River?

I'm looking for a little help on the way I played this hand specifically the river. I'm pretty sure I have the best hand up to the river but how would everyone play when the river card hits. Any other advice is welcome as well.

Party Poker 3/6 Hold'em (6 max, 5 handed) internettexasholdem.com

Preflop: Hero is BB with K[img]/images/graemlins/diamond.gif[/img], 8[img]/images/graemlins/club.gif[/img].
<font color="#666666">2 folds</font>, <font color="#CC3333">Button raises</font>, <font color="#666666">1 fold</font>, Hero calls.

Flop: (4.33 SB) 8[img]/images/graemlins/heart.gif[/img], 4[img]/images/graemlins/club.gif[/img], T[img]/images/graemlins/spade.gif[/img] <font color="#0000FF">(2 players)</font>
<font color="#CC3333">Hero bets</font>, Button calls.

Turn: (3.16 BB) 9[img]/images/graemlins/heart.gif[/img] <font color="#0000FF">(2 players)</font>
<font color="#CC3333">Hero bets</font>, Button calls.

River: (5.16 BB) 7[img]/images/graemlins/spade.gif[/img] <font color="#0000FF">(2 players)</font>