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function termpage_nav($term, $settings){
    // the trail is the collection of terms that connect the top level to
    // the currently active term
    $trail = $term ? array_reverse(taxonomy_get_parents_all($term->tid)) : array();

    // the settings specific to this block
    $vid = $settings[TERMPAGE_SETTINGS_VID];
    $max_depth = $settings[TERMPAGE_SETTINGS_MAXDEPTH];

    // the depth in the tree of the currently active term
    // - 1 to match the depth starting at 0 in the for loop
    $current_depth = count($trail) - 1;

    // the collection of terms that make up the trail. One term per level
    $levels = array();
    // variable used for taxonomy_get_tree
    $parent = 0;

    // depth 0 means first level
    for($depth = 0; $depth < $max_depth; $depth += 1){

        $current = taxonomy_get_tree($vid, $parent, 1);

        // some additional info for the template
        termpage_add_alias($current);
        $active = $depth <= $current_depth ? $trail[$depth]->tid : null;

        $parent = $active;

        $levels[$depth] = array(
            'terms'  => $current,
            'active' => $active,
        );
    }
    return $levels;
}