YOu have the wrong idea about pathfinding you should read this one for pathfinding without paths:(non dynamic)
http://www.coniserver.net/coni_users/web_users/pirvu/au/tutorials/zipped/pathfinding.zipand this one for dynamic A* pathfinding
http://www.coniserver.net/coni_users/web_users/pirvu/au/tutorials/zipped/astar_en.zipEDIT: If you want something simple you should use non dynamic pathfinding (point or path based) or try collision avoiding instead of pathfinding.
