What is the proper heimlich maneuver for unconscious person?

From MedlinePlus...: For a conscious person who is sitting or standing, position yourself behind the person and reach your arms around his or her waist. Place your fist, thumb side in, just above the person's navel and grab the fist tightly with your other hand. Pull your fist abruptly upward and inward to increase airway pressure behind the obstructing object and force it from the windpipe.