function showPage(page) {
            if (page == 1) {
                
                previousPage = 4;
            } else if (page==5) {
               previousPage = 1;
            } else {
                previousPage = page-1;
            }
            $(".page"+(previousPage)).fadeOut("normal",function() {
                $(".page"+page).fadeIn("normal");
            }
        );
}