jQuery(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
    });
});