index.php

<?php $template_directory = get_bloginfo('template_directory'); ?>
<?php $nav_id = 'home'; ?>
 <?php
  $nav_posts = $wpdb->get_results( "SELECT id FROM $wpdb->posts WHERE post_type = 'nav_menu_item' and post_status = 'publish' ORDER BY menu_order ASC" );

 $exclude = $base_pages = array();
foreach($nav_posts as $nav) {
       $_menu_item_object = get_post_meta($nav->id,'_menu_item_object',true);
       $post_status = get_post_status( get_post_meta($nav->id,'_menu_item_object_id',true) );
        if($_menu_item_object=='page' && $post_status=='publish') {
            $exclude[] = $_menu_item_object_id = get_post_meta($nav->id,'_menu_item_object_id',true);
            $base_pages[] = get_post($_menu_item_object_id);
            }
   }

 $second_pages = get_pages(array('exclude'=>$exclude));
  $pages = array_merge($base_pages,$second_pages);
     foreach($pages as $page) {
           $post = $page;

  setup_postdata($post);
  $pageName = get_the_title();

  $nav_id = strtolower(trim(str_replace(" ", "_", $pageName)));

   $template = get_post_meta($post->ID,'_wp_page_template',true);
   if( $template != '' && $template != 'default') include($template); else include("page.php");

 } ?>