# File lib/action_view/helpers/form_tag_helper.rb, line 393
      def image_submit_tag(source, options = {})
        options.stringify_keys!

        if confirm = options.delete("confirm")
          options["onclick"] ||= ''
          options["onclick"] += "return #{confirm_javascript_function(confirm)};"
        end

        tag :input, { "type" => "image", "src" => path_to_image(source) }.update(options.stringify_keys)
      end