Wordpress Divided Menu

gistfile1.php

function slice_menu($menu_name) {
    if ( ( $locations = get_nav_menu_locations() ) && isset( $locations[ $menu_name ] ) ) {
        $menu = wp_get_nav_menu_object( $locations[ $menu_name ] );

        $menu_items = wp_get_nav_menu_items($menu->term_id);

        $menu_list = '<dl class="sub-nav">';
        $menu_counter = count($menu_items);
        foreach ( (array) $menu_items as $key => $menu_item ) {
            $title = $menu_item->title;
            $url = $menu_item->url;
            $menu_list .= '<dd><a href="' . $url . '">' . $title . '</a></dd>';
            $menu_counter-- != 1 ?
                                 $menu_list .= '<dd>|</dd>'
                                 : '';
        }
        $menu_list .= '</dl>';
    } else {
        $menu_list = '<dl><dd>Menu "' . $menu_name . '" not defined.</dd></dl>';
    }

    echo $menu_list;
}