*** form_tag_helper.rb	2010-10-22 10:24:55.000000000 +0900
--- form_tag_helper_jishiha.rb	2010-10-22 11:16:43.000000000 +0900
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*** 409,414 ****
--- 409,415 ----
        #   prompt with the question specified. If the user accepts, the form is
        #   processed normally, otherwise no action is taken.
        # * <tt>:disabled</tt> - If set to true, the user will not be able to use this input.
+       # * <tt>:disable</tt> - If set to true, the submit button is disabled when the form is submitted.
        # * Any other key creates standard HTML options for the tag.
        #
        # ==== Examples
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*** 423,428 ****
--- 424,432 ----
        #
        #   image_submit_tag("agree.png", :disabled => true, :class => "agree_disagree_button")
        #   # => <input class="agree_disagree_button" disabled="disabled" src="/images/agree.png" type="image" />
+       #
+       #   image_submit_tag("purchase.png", :disable => true)
+       #   # => <input onclick="this.disabled = true;result = (this.form.onsubmit ? (this.form.onsubmit() ? this.form.submit() : false) : this.form.submit());if (result == false) { this.disabled = false; }return result;"src="/images/purchase.png" type="image" />
        def image_submit_tag(source, options = {})
          options.stringify_keys!

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*** 430,435 ****
--- 434,447 ----
            add_confirm_to_attributes!(options, confirm)
          end

+         if disable = options.delete("disable")
+           onclick = "#{options.delete('onclick')};" if options['onclick']
+
+           options["onclick"] = "this.setAttribute('originalValue', this.value);this.disabled = true;#{onclick}"
+           options["onclick"] << "result = (this.form.onsubmit ? (this.form.onsubmit() ? this.form.submit() : false) : this.form.submit());"
+           options["onclick"] << "if (result == false) { this.disabled = false; }return result;"
+         end
+
          tag :input, { "type" => "image", "src" => path_to_image(source) }.update(options.stringify_keys)
        end