Greetings. Let me begin by telling you the author's name - Horacio although he doesn't really like becoming called like that. To do archery is the factor he enjoys most. Administering databases is his day job now but he plans on altering it. His home is now in Minnesota. You can usually find his web site here: http://limc.ufrj.br/mathmoodle/user/view.php?id=11139&course=1