http://virtualclass.com.br/templates/rt_fresco/js/gantry-totop.js
http://unicesar.edu.co/templates/rt_fresco/js/gantry-totop.js
http://liwaschool.com/templates/rt_fresco/js/gantry-totop.js
http://dinet.org/templates/rt_fresco_responsive/js/gantry-totop.js