hidden-input.liquid

      // hide the hidden-input
      $('.hidden-input').hide();

      // attach an ID to the checkbox so it's toggleable 
      $('#infiniteoptions-container > div.conditional > span > fieldset > label > input').attr('id', 'hidden');

      // if the checkbox is checked, toggle the hidden input to show it
      $('#hidden').click(function() {
      	$(".hidden-input").toggle(this.checked);
      });