(function () {
  var _allGalls = $('.pageGallery');

  function switchGallery(e) {
    var clicked = (e.target) ? e.target : e.srcElement;
    var gallery = $(clicked).nextAll('.pageGallery');
    gallery.slideToggle(2000);
  }

  _allGalls.hide();
  $('.showGallery').click(switchGallery);
})();