function build_nav_string($cat_id)
{
    global $config_vars, $lang;
    //get the navigation string
    $cat = new categorie();
    $result = $cat->generate_from_id($cat_id);
    if ($result) {
    }
    $parent_cats = $cat->get_parent_cat_array();
    //build the navigation string
    for ($i = 0; $i < sizeof($parent_cats); $i++) {
        $nav_string[$i]['id'] = $parent_cats[$i]['id'];
        $nav_string[$i]['name'] = $parent_cats[$i]['name'];
    }
    return $nav_string;
}