# File lib/action_view/helpers/active_record_helper.rb, line 105
      def error_message_on(object, method, prepend_text = "", append_text = "", css_class = "formError")
        if (obj = (object.respond_to?(:errors) ? object : instance_variable_get("@#{object}"))) &&
          (errors = obj.errors.on(method))
          content_tag("div", "#{prepend_text}#{errors.is_a?(Array) ? errors.first : errors}#{append_text}", :class => css_class)
        else 
          ''
        end
      end