flopped 2nd-nut flush, 4th spade on turn and a side pot (2/4 6-max)

[snappo]

Button is very LAG preflop. I'm not really sure of his postflop play.

In particular I don't like my river play at all. Or maybe I messed up on the turn?

Party Poker No-Limit Hold'em, $ Hero (6 max, 6 handed) converter

CO ($130)
Button ($476.85)
SB ($121)
Hero ($838.58)
UTG ($63.75)
MP ($104)

Preflop: Hero is BB with K[img]/images/graemlins/spade.gif[/img], 4[img]/images/graemlins/spade.gif[/img]. CO posts a blind of $6. SB posts a blind of $2.
<font color="#CC3333">UTG raises to $8</font>, <font color="#666666">1 fold</font>, CO (poster) calls $4, Button calls $8, SB (poster) calls $6, Hero calls $4.

Flop: ($42) Q[img]/images/graemlins/spade.gif[/img], 8[img]/images/graemlins/spade.gif[/img], 6[img]/images/graemlins/spade.gif[/img] <font color="#0000FF">(5 players)</font>
SB checks, <font color="#CC3333">Hero bets $40</font>, UTG calls $40, CO folds, Button calls $40, SB folds.

Turn: ($162) T[img]/images/graemlins/spade.gif[/img] <font color="#0000FF">(3 players)</font>
Hero checks, UTG calls $15.75 (All-In), Button calls $15.75, Hero calls $15.75.

River: ($209.25) A[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(3 players, 1 all-in)</font>
<font color="#CC3333">Hero bets $100</font>, <font color="#CC3333">Button raises to $275</font>, Hero folds.

Final Pot: $584.25