/**
  * All JS & CSS.
  *
  * @return string HTML
  */
 protected function output_head()
 {
     google_charts_renderer::render();
     $head = '<script src="webapp/js/jquery.js"></script>';
     $head .= '<script src="webapp/js/jquery-ui.js"></script>';
     $head .= '<script src="webapp/js/ui.js"></script>';
     $head .= '<link rel="stylesheet" type="text/css" href="webapp/css/styles.css" />';
     $head .= '<link rel="stylesheet" type="text/css" href="webapp/css/redmond/jquery-ui.css" />';
     return $head;
 }