def javascript_include_tag(js_file)
      js_file = js_file + '.js' unless js_file.end_with?('.js')
      path = normalize_path(File.join('/js', js_file))
      content_tag 'script', 'type' => 'text/javascript', 'src' => path
    end
def javascript_include_tag(js_file)
      js_file = js_file + '.js' unless js_file.end_with?('.js')
      path = normalize_path(File.join('/js', js_file))
      content_tag 'script', 'type' => 'text/javascript', 'src' => path
    end
h is provided by ERB::Util.