add custom login page link and logout link to WP Nav

function madd_login_logout_link($items, $args)
{
if(is_user_logged_in())
{
$newitems = '<li><a title="Logout" href="'. wp_logout_url('index.php') .'">log out</a></li>';
$items .= $newitems;
}
else
{
$newitems = '<li class="nav-login"><a href="/login-now">Login</a></li>';
$items .= $newitems;
}
return $items;
}
add_filter('wp_nav_menu_items', 'madd_login_logout_link', 10, 2);