gistfile1.rb

    def order_subtotal(order, options={})
      options.assert_valid_keys(:format_as_currency, :show_vat_text)
      options.reverse_merge! :format_as_currency => true, :show_vat_text => true

      amount =  order.total

      out = options.delete(:format_as_currency) ? number_to_currency(amount) : amount
      content_tag(:span, out, :class => "foo")
    end