Create a menu using WP's native engine.

wp_native_menu.php

<?php
    $defaults = array(
        'theme_location'  => '',
        'menu'            => 'topmenu',
        'container'       => '',
        'container_class' => '',
        'container_id'    => '',
        'menu_class'      => 'wrapper',
        'menu_id'         => '',
        'echo'            => true,
        'fallback_cb'     => 'wp_page_menu',
        'before'          => '',
        'after'           => '',
        'link_before'     => '',
        'link_after'      => '',
        'items_wrap'      => '<ul id="%1$s" class="%2$s">%3$s</ul>',
        'depth'           => 0,
        'walker'          => ''
    );

  wp_nav_menu($defaults);
?>