Having trouble editing my navigation bar

[swizydo]

Hy, i have been trying to add more option to my nav bar but it fails, i just want to add contact us,faq,terms and privacy as a drop down button to the bottom of the navigation list please any help? here is the nav bar code

<?php

// man navigation items
$headerNavigation = array();

// non logged in users
if (SITE_CONFIG_ENABLE_USER_REGISTRATION != 'no') {
    $headerNavigation['register'] = array(
        'link_url' => coreFunctions::getCoreSitePath() . '/register.' . SITE_CONFIG_PAGE_EXTENSION,
        'link_text' => t('register', 'register'),
        'link_key' => 'register',
        'user_level_id' => array(0),
        'position' => 100
    );
}

if (UserPeer::enableUpgradePage() == 'yes') {
    $headerNavigation['premium'] = array(
        'link_url' => coreFunctions::getCoreSitePath() . '/upgrade.' . SITE_CONFIG_PAGE_EXTENSION,
        'link_text' => t('premium', 'premium'),
        'link_key' => 'upgrade',
        'user_level_id' => array(0),
        'position' => 200
    );
}

$headerNavigation['login'] = array(
    'link_url' => coreFunctions::getCoreSitePath() . '/login.' . SITE_CONFIG_PAGE_EXTENSION,
    'link_text' => t('login', 'login'),
    'link_key' => 'login',
    'user_level_id' => array(0),
    'position' => 400
);

// logged in users
$headerNavigation['your_files'] = array(
    'link_url' => coreFunctions::getCoreSitePath() . '/account_home.' . SITE_CONFIG_PAGE_EXTENSION,
    'link_text' => t('your_albums', 'your albums'),
    'link_key' => 'your_files',
    'user_level_id' => range(1, 20),
    'position' => 30
);

if (UserPeer::enableUpgradePage() == 'yes') {
    $label = t('uprade_account', 'upgrade account');
    if ($Auth->hasAccessLevel(2)) {
        $label = t('extend_account', 'extend account');
    }
    $headerNavigation['upgrade'] = array(
        'link_url' => coreFunctions::getCoreSitePath() . '/upgrade.' . SITE_CONFIG_PAGE_EXTENSION,
        'link_text' => $label,
        'link_key' => 'upgrade',
        'user_level_id' => range(1, 20),
        'position' => 200
    );
}

// logged in users
$headerNavigation['settings'] = array(
    'link_url' => coreFunctions::getCoreSitePath() . '/account_edit.' . SITE_CONFIG_PAGE_EXTENSION,
    'link_text' => t('file_manager_account_settings', 'Account Settings'),
    'link_key' => 'settings',
    'user_level_id' => range(1, 20),
    'position' => 999
);