$(document).ready(function(){

  $('.gallery_demo_unstyled').addClass('gallery_demo'); // adds new class name to maintain degradability

  $('ul.gallery_demo').galleria({
    history   : true, // activates the history object for bookmarking, back-button etc.
    clickNext : true, // helper for making the image clickable
    insert    : '#main_image', // the containing selector for our main image
    onImage   : function(image,caption,thumb) { // let's add some image effects for demonstration purposes

      // fade in the image & caption
      image.css('display','none').fadeIn(1000);
      caption.css('display','none').fadeIn(1000);

      // fetch the thumbnail container
      var _li = thumb.parents('li');

      // fade out inactive thumbnail
      _li.siblings().children('img.selected').fadeTo(500,0.3);

      // fade in active thumbnail
      thumb.fadeTo('fast',1).addClass('selected');

      // add a title for the clickable image
      image.attr('title','Next image >>');
    },
    onThumb : function(thumb) { // thumbnail effects goes here

      // fetch the thumbnail container
      var _li = thumb.parents('li');

      // if thumbnail is active, fade all the way.
      var _fadeTo = _li.is('.active') ? '1' : '0.3';

      // fade in the thumbnail when finnished loading
      thumb.css({display:'none',opacity:_fadeTo}).fadeIn(1500);

      // hover effects
      thumb.hover(
        function() { thumb.fadeTo('fast',1); },
        function() { _li.not('.active').children('img').fadeTo('fast',0.3); } // don't fade out if the parent is active
      )
    }
  });
});