Promotion Slider - Custom Excerpt

remove_action('promoslider_content', 'promoslider_display_excerpt');
add_action('promoslider_content', 'promoslider_display_new_excerpt');

function promoslider_display_new_excerpt( $values ) {
       global $post;
       extract($values);
       // If there is no excerpt, don't do anything
       if( !$excerpt )
               return;
       // If add code is being displayed, don't show the excerpt
       if( get_post_meta($post->ID, '_promo_slider_show_ad_code', TRUE) )
               return;
       // Otherwise, if there is an excerpt, display it
       switch( $display_excerpt ){
               case 'excerpt':
                       $title = $display_title ? "<span class=\"promo_slider_excerpt_title\">{$post->post_title}</span>": false;
                       echo <<<HTML
<div class="promo_slider_excerpt">
       {$title}
       {$excerpt}
</div>
HTML;
                       break;
       }
}