Hall Sensor automatic current reversing project

I started out here: http://forum.allaboutcircuits.com/showthread.php?t=22652
with a question about automatic current switching on an electromagnet. Allow me to explain somewhat.

The goal: Detect magnetism and then tell the DC power supplied to an electromagnet to reverse current. Stay in this state until magnetism is detected again and then switch again.

Some nice souls pointed me into the right direction (I hope!)

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Mr. Arkham
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