JQuery ->
  $('a#add_image_form').click ->
    regex = /add_image_form_\d{1,3}/
    data = $(this).attr('data').toString()

    imgId = data.match(regex)[0].match /\d{1,3}/
    newId = parseInt(imgId) + 1

    newData = "add_image_form_".concat(newId)

    $(this).attr('data', newData)

    $(this).parent().before("
      <p>
        <label for='gallery_pictures_attributes_#{newId}_caption'>Caption</label>
        <input id='gallery_pictures_attributes_#{newId}_caption' name='gallery[pictures_attributes][#{newId}][caption]' size='30' type='text' />
      </p>
      <p>
        <input id='gallery_pictures_attributes_#{newId}_image' name='gallery[pictures_attributes][#{newId}][image]' type='file' />
      </p>
    ")