private function buildPhamePostHeader(PhamePost $post)
 {
     $image = null;
     if ($post->getHeaderImagePHID()) {
         $image = phutil_tag('div', array('class' => 'phame-header-hero'), phutil_tag('img', array('src' => $post->getHeaderImageURI(), 'class' => 'phame-header-image')));
     }
     $title = phutil_tag_div('phame-header-title', $post->getTitle());
     $subtitle = null;
     if ($post->getSubtitle()) {
         $subtitle = phutil_tag_div('phame-header-subtitle', $post->getSubtitle());
     }
     return phutil_tag_div('phame-mega-header', array($image, $title, $subtitle));
 }