Вот вам для размышлений:http://www.scribd.com/doc/9296822/%D0%9A-%D0%99-%D0%A5%D0%B0%D0%B9%D0%BD%D0%B5%D0%BC%D0%B0%D0%BD-%D0%9F%D0%BE%D0%B2%D1%80%D0%B5%D0%B6%D0%B4%D0%B5%D0%BD%D0%B8%D1%8F-%D1%82%D1%80%D1%83%D0%B1%D0%BE%D0%BF%D1%80%D0%BE%D0%B2%D0%BE%D0%B4%D0%BE%D0%B2