$(document).ready(function(){

                $('.gallery_demo_unstyled').addClass('gallery_demo'); // adds new class name to maintain degradability
                $('.nav').css('display','none'); // hides the nav initially

                $('ul.gallery_demo').galleria({
                        history   : false, // deactivates the history object for bookmarking, back-button etc.
                        clickNext : false, // helper for making the image clickable. Let's not have that in this example.
                        insert    : undefined, // the containing selector for our main image.
                                                                   // If not found or undefined (like here), galleria will create a container
                                                                   // before the ul with the class .galleria_container (see CSS)
                        onImage   : function() { $('.nav').css('display','block'); } // shows the nav when the image is showing
                });
        });