a.menu-3617, ul.links li.menu-3617 a {
  background-image: url(http://sssa.bioroboticsinstitute.it/sites/default/files/styles/menu_icons_14x14/public/sites/all/themes/theme571/images/custom/icon_facebook.jpg);
  padding-right:14px;
  background-repeat: no-repeat;
  background-position: right;
  height: 14px;
}

a.menu-3618, ul.links li.menu-3618 a {
  background-image: url(http://sssa.bioroboticsinstitute.it/sites/default/files/styles/menu_icons_14x14/public/sites/all/themes/theme571/images/custom/icon_youtube.jpg);
  padding-right:14px;
  background-repeat: no-repeat;
  background-position: right;
  height: 14px;
}