Tiarin

Never mind, I got it working:

echo '<span class="list-pages-home-thumb">';

if (class_exists('MultiPostThumbnails')
    && MultiPostThumbnails::has_post_thumbnail('page', 'page-secondary-image',$pagg->ID)) {
    MultiPostThumbnails::the_post_thumbnail('page', 'page-secondary-image', $pagg->ID, 'home-thumb');
  }

	echo '</span>';