Party 50/100 TT annoys me

[veganmav]

SB is 14/10/2.4
Button is 40/20/.73

Party Poker 50/100 Hold'em (10 handed) pokerhand.org hand converter

Preflop: Hero is CO with T[img]/images/graemlins/spade.gif[/img], T[img]/images/graemlins/club.gif[/img].
<font color="#666666">6 folds</font>, <font color="#CC3333">Hero raises</font>, Button calls, SB calls, <font color="#666666">1 fold</font>.

Flop: (7 SB) K[img]/images/graemlins/club.gif[/img], K[img]/images/graemlins/spade.gif[/img], 7[img]/images/graemlins/heart.gif[/img] <font color="#0000FF">(3 players)</font>
<font color="#CC3333">SB bets</font>, <font color="#CC3333">Hero raises</font>, Button calls, SB calls.

Turn: (6.50 BB) 4[img]/images/graemlins/diamond.gif[/img] <font color="#0000FF">(3 players)</font>
SB checks, <font color="#CC3333">Hero bets</font>, Button calls, SB calls.

River: (9.50 BB) 5[img]/images/graemlins/heart.gif[/img] <font color="#0000FF">(3 players)</font>
SB checks, <font color="#CC3333">Hero bets</font>, <font color="#CC3333">Button raises</font>, SB folds, Hero..?

How easy is this river fold?
If you don't have the discipline to fold to a raise, do you consider checking this river?
It would get the button to bet some hands too...

What thoughts am i missing, what do I need to analyze that I am not?... did I play anything else wrong in this hand?

thanks in advance

[Jay.]

Easy fold, he was overcalling to keep the player behind in.