How to counter a continuation bet?

[Woolygimp]

Party Poker No-Limit Hold'em, $ BB (10 handed) FTR converter on zerodivide.cx

saw flop|<font color="#C00000">saw showdown</font>

MP1 ($155.50)
MP2 ($115.50)
MP3 ($202.20)
CO ($200)
Button ($248.79)
SB ($209.55)
BB ($301.50)
UTG ($366.20)
UTG+1 ($216.50)
Hero ($181.15)

Preflop: Hero is UTG+2 with 8[img]/images/graemlins/heart.gif[/img], 8[img]/images/graemlins/spade.gif[/img]. SB posts a blind of $1.
<font color="#666666">2 folds</font>, Hero calls $2, <font color="#666666">4 folds</font>, <font color="#CC3333">Button raises to $9</font>, <font color="#666666">2 folds</font>, Hero calls $7.

Flop: ($21) J[img]/images/graemlins/spade.gif[/img], 4[img]/images/graemlins/heart.gif[/img], J[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(2 players)</font>
Hero checks, <font color="#CC3333">Button bets $20</font>, <font color="#CC3333">Hero ???

My default line here is to check/fold, sometimes lead out. If your fairly confident your opponent is on overcards and that your 88 is good what line is the most effective?

Leading out seems good, obviously fold to any resistance.
Does anyone c/r here and if so how much? The reason I ask is this seems like one of the few times to use a min-raise. You don't want to commit anymore chips than is necessary to take down the pot &amp; most players will fold overs to any raise on this board.

So assuming I use the line:
Hero Checks, Villain Bets Pot (20), Hero raises to 40.
Exactly how effective is this line in this situation?

And yes I know, "If I think im ahead I should lead out PSB."