protected static function getScripts(HTML_Head $head)
 {
     $match = $head->getElementsBy('tag', 'scripts');
     return $match[0];
 }
 protected static function getScripts(HTML_Head $head)
 {
     $match = $head->getElementsBy('tag', 'scripts');
     if (empty($match)) {
         throw new Template_Invalid_Structure_Exception('scripts tag missing in head template');
     }
     return $match[0];
 }