Two Horizontal Menu Bars in Custom Theme

Hello,

I am trying to create two horizontal menu bars so that I can have two languages on this website (German and English). http://www.artboxcouture.com/

I have created both menus in the menu section in the wordpress admin panel and added this function to my functions.php file.

/ Create a function for register_nav_menus()
function add_wp3menu_support() {

register_nav_menus(
        array(
        'main-menu' => __('Main Navigation'),
        'another-menu' => __('Another Navigation')
        )
     );

}

The German menu is primary and is displaying on the website. I would the the ‘another navigation’ menu or the English menu to appear once the user clicks on English and then on all of the English pages. I am not quire sure what needs to be added to functions.php and/or header.php for this to happen. Here is what I have though:

functions.php:

add_action('init', 'add_wp3menu_support');

 function show_menu() {
  if ( is_page('English') )
  {
    if ( has_nav_menu( 'another-menu' ) )
      { wp_nav_menu( array( 'theme_location' => 'another-menu' ) ); }
  }
}

header.php:

<?php
          wp_nav_menu( array(
    'theme_location' => 'main-menu', // Setting up the location for the main-menu, Main Navigation.
    'menu_class' => 'dropdown', //Adding the class for dropdowns
    'container_id' => 'navwrap', //Add CSS ID to the containter that wraps the menu.
    'fallback_cb' => 'wp_page_menu', //if wp_nav_menu is unavailable, WordPress displays wp_page_menu function, which displays the pages of your blog.
    )
      );      

         ?>

Thank you for your help!