Try an old carpenter's trick. Tap the pin out of your top door hinge using a hammer. Lay the pin on a flat surface and use your hammer to put a very slight bend in the pin. Once you reinstall the pin, the door will no longer close on its own, but should easily close manually.
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Plumb the door. A door that is properly hung and level will not close until you manually close it. If your door is not plumb, place wooden shims behind the hinges, under the legs of the frame or between the frame and the wall until the opening is plumb. Use your level as you work to check whether the frame and the door are level, and experiment with the placement of your shims until you are satisfied. You can also adjust the screws in each hinge by loosening or tightening them a bit, as this can affect the swing of the door as well.
Read more: How to Stop a Door From Closing | eHow.com http://www.ehow.com/how_5095013_stop-door-closing.html#ixzz1U55wbFWp
J, August 2011