function show_hide_previous(elem)
{
    if (active_filter_id != elem) {
        $('#'+active_filter_id).hide();
    }
    if ($('#'+elem).is(':hidden')) {
        active_filter_id = elem;
        show_hide_add_active_element(elem);
        $('#'+elem).fadeIn(250);
    } else {
        $('#'+elem).fadeOut(250);
        active_filter_id = '';
    }
}