$(document).ready(function(){
    
    $('.gallery_demo_unstyled').addClass('gallery_demo'); // adds new class name to maintain degradability
    
    $('ul.gallery_demo').galleria({
        history   : false, // 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(500,0.6);
            
            // 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' : '0.6';
            
            // 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',0.6); } // don't fade out if the parent is active
            )
        }
    });
});