public function css_class($append = array())
{
$classes = $append;
$classes[] = 'comment';
$classes[] = 'comment-' . $this->id;
$classes[] = 'type-' . $this->typename;
$classes[] = 'status-' . $this->statusname;
$classes[] = 'comment-post-' . $this->post->id;
return implode(' ', $classes);
}