Shadowbox next/prev lightbox-like navigation implementation

gistfile1.js

Shadowbox.init({ 
    onFinish : function(az) {
        var navBtnRight = $("<div/>").addClass('shadowbox-nav shadowbox-next').html($("<a/>") .click(function(){Shadowbox.next();})); 
        var navBtnLeft = $("<div/>").addClass('shadowbox-nav shadowbox-prev').html($("<a/>").click(function(){Shadowbox.previous();})); 
        $("#sb-body-inner").prepend(navBtnRight )
                           .prepend(navBtnLeft);
        
        $('.shadowbox-nav').hover(
                        function() {
                            if(
                                ( $(this).hasClass('shadowbox-next') && !Shadowbox.hasNext() )
                                ||
                                ( $(this).hasClass('shadowbox-prev') && Shadowbox.current == 0 )
                              )
                                return true;
                            $(this).find('a').fadeIn();
                        },
                        function() {
                            $(this).find('a').fadeOut();
                        }
                    );
    }
});