WooCommerce 2.0 Custom Product Tab for WP Download Monitor

<?php

/**
 * Custom Tabs for Downloads Display from Download Monitor Plugin by Mike Jolley. Compatible with WooCommerce 2.0+ only!
 *
 * Outputs an extra tab to the default set of info tabs on the single product page.
 * This file needs to be called via your functions.php file.

 */
function custom_tab_options_tab_down() {
?>
    <li class="custom_tab2"><a href="#custom_tab_data2"><?php _e('Custom Tab 2', 'woothemes'); ?></a></li>
<?php
}
add_action('woocommerce_product_write_panel_tabs', 'custom_tab_options_tab_down');


/**
 * Custom Tab Options
 *
 * Provides the input fields and add/remove buttons for custom tabs on the single product page.
 */
function custom_tab_options_down() {
    global $post;

    $custom_tab_options_down = array(
        'titleb' => get_post_meta($post->ID, 'custom_tab_title_down', true),
        'contentb' => get_post_meta($post->ID, 'custom_tab_content_down', true),
    );

?>
    <div id="custom_tab_data2" class="panel woocommerce_options_panel">
        <div class="options_group">
            <p class="form-field">
                <?php woocommerce_wp_checkbox( array( 'id' => 'custom_tab_enabled_down', 'label' => __('Enable Custom Tab?', 'woothemes'), 'description' => __('Enable this option to enable the custom tab on the frontend.', 'woothemes') ) ); ?>
            </p>
        </div>

        <div class="options_group custom_tab_options">
            <p class="form-field">
                <label><?php _e('Custom Tab Title:', 'woothemes'); ?></label>
                <input type="text" size="5" name="custom_tab_title_down" value="<?php echo @$custom_tab_options_down['titleb']; ?>" placeholder="<?php _e('Enter your custom tab title', 'woothemes'); ?>" />
            </p>

            <p class="form-field">
                <?php _e('Custom Tab Content:', 'woothemes'); ?>
            </p>

            <table class="form-table">
                <tr>
                    <td>
                        <textarea class="theEditor" rows="10" cols="40" name="custom_tab_content_down" placeholder="<?php _e('Enter your custom tab content', 'woothemes'); ?>"><?php echo @$custom_tab_options_down['contentb']; ?></textarea>
                    </td>
                </tr>
            </table>
        </div>
    </div>
<?php
}
add_action('woocommerce_product_write_panels', 'custom_tab_options_down');


/**
 * Process meta
 *
 * Processes the custom tab options when a post is saved
 */
function process_product_meta_custom_tab_down( $post_id ) {
    update_post_meta( $post_id, 'custom_tab_enabled_down', ( isset($_POST['custom_tab_enabled_down']) && $_POST['custom_tab_enabled_down'] ) ? 'yes' : 'no' );
    update_post_meta( $post_id, 'custom_tab_title_down', $_POST['custom_tab_title_down']);
    update_post_meta( $post_id, 'custom_tab_content_down', $_POST['custom_tab_content_down']);
}
add_action('woocommerce_process_product_meta', 'process_product_meta_custom_tab_down', 10, 2);


/**
 * Display Tab
 *
 * Display Custom Tab on Frontend of Website for WooCommerce 2.0
 */

add_filter( 'woocommerce_product_tabs', 'woocommerce_product_custom_tab_down' );


    function woocommerce_product_custom_tab_down( $tabs ) {
        global $post, $product;

        $custom_tab_options_down = array(
            'enabled' => get_post_meta($post->ID, 'custom_tab_enabled_down', true),
            'titleb' => get_post_meta($post->ID, 'custom_tab_title_down', true),
            'contentb' => get_post_meta($post->ID, 'custom_tab_content_down', true),
        );


            if ( $custom_tab_options_down['enabled'] != 'no' ){
                $tabs['custom-tab-third'] = array(
                    'title'    => $custom_tab_options_down['titleb'],
                    'id' => 'test_multicheckbox',
                    'priority' => 35,
                    'callback' => 'custom_product_tabs_panel_content_down',
                    'content'  => $custom_tab_options_down['contentb']
                );
            }

        return $tabs;
    }

    /**
     * Render the custom product tab panel content for the callback 'custom_product_tabs_panel_content_down'
     */
   function custom_product_tabs_panel_content_down( $key, $custom_tab_options_down ) {
        global $post, $product;

        $custom_tab_options_down = array(
            'enabled' => get_post_meta($post->ID, 'custom_tab_enabled_down', true),
            'titleb' => get_post_meta($post->ID, 'custom_tab_title_down', true),
            'contentb' => get_post_meta($post->ID, 'custom_tab_content_down', true),
        );

        $downloads = get_post_meta($post->ID, 'custom_tab_content_down', true);
        $nsoutput = do_shortcode( $downloads ) ;

        echo '<h2>' . $custom_tab_options_down['titleb'] . '</h2>';
        print $nsoutput;
    }

?>