table.tablesorter thead tr .tablesorter-header {
    background-image: url(/js/jquery/plugin/tablesorter/img/bg.gif);
    background-repeat: no-repeat;
    background-position: center right;
    cursor: pointer;
}
table.tablesorter thead tr .tablesorter-headerAsc {
    background-image: url(/js/jquery/plugin/tablesorter/img/asc.gif);
}
table.tablesorter thead tr .tablesorter-headerDesc {
    background-image: url(/js/jquery/plugin/tablesorter/img/desc.gif);
}
table.tablesorter thead tr .sorter-false {
    background-image: none;
    cursor: default;
}