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Help with Arduino

I've posted the entire message on the arduino forums, but i know there is people that use it here.
It's a circuit to allow arduino run with battery and at the same time, to allow charging without disconecting it.

So I ask you the same question, will it work? Right now it's only a design.

http://www.arduino.cc/cgi-bin/yabb2/YaBB.pl?num=1206893992

Thanks

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