Blind Steal Situation

[waynethetrain]

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Do I raise on the flop or do I call down and raise on the turn or river?

Party Poker 1/2 Hold'em (10 handed) converter

Preflop: Hero is Button with A[img]/images/graemlins/club.gif[/img], Q[img]/images/graemlins/heart.gif[/img].
<font color="#666666">7 folds</font>, <font color="#CC3333">Hero raises</font>, <font color="#666666">1 fold</font>, BB calls.

Flop: (4.50 SB) 6[img]/images/graemlins/diamond.gif[/img], 2[img]/images/graemlins/spade.gif[/img], A[img]/images/graemlins/diamond.gif[/img] <font color="#0000FF">(2 players)</font>
<font color="#CC3333">BB bets</font>, <font color="#CC3333">Hero ?