.icon-individual-news-sort:hover {
    background-image: url("/mod/nmwp-ui/themes/nmwp/graphics/icons/news-sort-nmwp.png");
}
.icon-individual-calendar-sort:hover {
    background-image: url("/mod/nmwp-ui/themes/nmwp/graphics/icons/calendar-sort-nmwp.png");
}