function art_menu_items_down()
{
    global $artThemeSettings;
    
    if ('Pages' === $artThemeSettings['menu.source'])
    {
        art_print_homepage();
        
        add_action('get_pages', 'art_menu_get_pages_filter');
        add_action('wp_list_pages', 'art_menu_list_pages_filter');
        
        wp_list_pages('include=11,12,13,14,15,16,17&title_li=&sort_column=menu_order');
        
        remove_action('wp_list_pages', 'art_menu_list_pages_filter');
        remove_action('get_pages', 'art_menu_get_pages_filter');
    }
    else
    {
        add_action('get_terms', 'art_menu_get_terms_filter');
        add_action('wp_list_categories', 'art_menu_wp_list_categories_filter');
        
        wp_list_categories('title_li=');
        
        remove_action('wp_list_categories', 'art_menu_wp_list_categories_filter');
        remove_action('get_terms', 'art_menu_get_terms_filter');
    }
}

wp_list_posts('include=11,12,13,14,15,16,17&title_li=&sort_column=menu_order');

<?php
$some_posts = get_posts('include=11,12,13,14,15,16,17');
foreach( $some_posts as $post ) :
?>
<li><a href="<?php the_permalink(); ?>"><?php the_title(); ?></a></li>
<?php endforeach; ?>

$some_posts = get_posts('include=11,12,13,14,15,16,17');
foreach( $some_posts as $post ) :

echo "<li><a href='".the_permalink()."'>".the_title()."</a></li>";
endforeach;

wp_list_pages('include=11,12,13,14,15,16,17&title_li=&sort_column=menu_order');

function wp_list_posts(){
$some_posts = get_posts('include=11,12,13,14,15,16,17');
foreach( $some_posts as $post ) :
echo "<li><a href='".the_permalink()."'>".the_title()."</a></li>";
endforeach;
}