не, это на классниках  http://www.shkolaurodov.com/2010/12/14/%D0%B8-%D0%B2-%D1%85%D1%80%D0%B5%D0%BD-%D0%B4%D1%8B%D1%88%D0%B0%D0%BB%D0%B8-%D1%8D%D1%80%D0%BE%D1%82%D0%B8%D1%87%D0%BD%D0%BE-%D0%BD%D0%BE-%D0%BC%D1%8B-%D0%B2%D0%B5%D0%BB%D0%B8-%D1%81%D0%B5%D0%B1/#more-2673