Did I mess up the cowboys?

[NoTalent]

With the cap on the flop, and three callers I figured someone for a set, or a large pair (no aces because preflop wasn't capped). I decided to check call from there. Should I have folded instead of calling down--or should I have raised to see if they really had anything? What do you think of my play?

Regards,
NoTalent

Party Poker 2/4 Hold'em (7 handed) converter

Preflop: Hero is CO with K[img]/images/graemlins/heart.gif[/img], K[img]/images/graemlins/club.gif[/img].
<font color="666666">2 folds</font>, <font color="CC3333">MP2 raises</font>, <font color="CC3333">Hero 3-bets</font>, Button calls, <font color="666666">1 fold</font>, BB <font color="purple">(LAG)</font> calls, MP2 calls.

Flop: (12.50 SB) 3[img]/images/graemlins/club.gif[/img], 6[img]/images/graemlins/heart.gif[/img], 5[img]/images/graemlins/club.gif[/img] <font color="blue">(4 players)</font>
<font color="CC3333">LAG bets</font>, MP2 calls, <font color="CC3333">Hero raises</font>, Button calls, LAG calls, <font color="CC3333">MP2 3-bets</font>, <font color="CC3333">Hero caps</font>, Button calls, LAG calls, MP2 calls.

Turn: (14.25 BB) 8[img]/images/graemlins/heart.gif[/img] <font color="blue">(4 players)</font>
LAG checks, MP2 checks, Hero checks, <font color="CC3333">Button bets</font>, LAG calls, MP2 calls, Hero calls.

River: (18.25 BB) 6[img]/images/graemlins/diamond.gif[/img] <font color="blue">(4 players)</font>
LAG checks, MP2 checks, Hero checks, Button checks.

Final Pot: 18.25 BB
<font color="green">Main Pot: 18.25 BB, between LAG, MP2, Hero and Button.</font>