    # File lib/action_view/helpers/prototype_helper.rb, line 1043
          def options_for_ajax(options)
            js_options = build_callbacks(options)

            js_options['asynchronous'] = options[:type] != :synchronous
            js_options['method']       = method_option_to_s(options[:method]) if options[:method]
            js_options['insertion']    = "'#{options[:position].to_s.downcase}'" if options[:position]
            js_options['evalScripts']  = options[:script].nil? || options[:script]

            if options[:form]
              js_options['parameters'] = 'Form.serialize(this)'
            elsif options[:submit]
              js_options['parameters'] = "Form.serialize('#{options[:submit]}')"
            elsif options[:with]
              js_options['parameters'] = options[:with]
            end

            if protect_against_forgery? && !options[:form]
              if js_options['parameters']
                js_options['parameters'] << " + '&"
              else
                js_options['parameters'] = "'"
              end
              js_options['parameters'] << "#{request_forgery_protection_token}=' + encodeURIComponent('#{escape_javascript form_authenticity_token}')"
            end

            options_for_javascript(js_options)
          end