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I didn't see it but if it's as you describe it should not be offside. What matters is the position when the ball is played by your teammate not off the the post.
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Poor quality, but you can see the play starting at about 5:15 of the following highlight video:
http://youtube.com/watch?v=ydtl8RY5ID0
(At about 6:28, they replay it again, but only to show A1 being pulled down.)