Order Posts by order number

functions.php

/* Also, add the plugin Simple Page Ordering to enable the ability to drag and drop posts to a specified order

add_action( 'genesis_before_loop', 'ntg_do_query' );
/** Changes the Query before the Loop */
function ntg_do_query() {
  $posttype = get_post_type();
    if( $posttype == 'portfolio'){
        global $query_string;
 
        query_posts( wp_parse_args( $query_string, array( 'orderby' => 'menu_order', 'order' => 'ASC' ) ) );
    }
 
}