div.sortable thead tr.row0 th:not(.sorttable_sorted):not(.sorttable_sorted_reverse):not(.sorttable_nosort):after { 
    content: " \25B4\25BE" 
}

div.sortable thead tr.row0 th.sorttable_sorted:after { 
    content: " \25BE" 
}

div.sortable thead tr.row0 th.sorttable_sorted_reverse:after { 
    content: " \25B4" 
}