public function headJs()
    {
        $domain = $this->wa->getRouting()->getDomain(null, true);
        $domain_config_path = $this->wa->getConfig()->getConfigPath('domains/' . $domain . '.php', true, 'site');
        if (file_exists($domain_config_path)) {
            /**
             * @var $domain_config array
             */
            $domain_config = (include $domain_config_path);
            $html = '';
            if (!empty($domain_config['head_js'])) {
                $html .= $domain_config['head_js'];
            }
            if (!empty($domain_config['google_analytics'])) {
                $html .= <<<HTML
<script type="text/javascript">
  var _gaq = _gaq || [];
  _gaq.push(['_setAccount', '{$domain_config['google_analytics']}']);
  _gaq.push(['_trackPageview']);
 {$this->wa->getResponse()->getGoogleAnalytics()}
  (function() {
      var ga = document.createElement('script'); ga.type = 'text/javascript'; ga.async = true;
      ga.src = ('https:' == document.location.protocol ? 'https://ssl' : 'http://www') + '.google-analytics.com/ga.js';
      var s = document.getElementsByTagName('script')[0]; s.parentNode.insertBefore(ga, s);
  })();
</script>
HTML;
            }
            return $html;
        }
        return '';
    }