<link href="//netdna.bootstrapcdn.com/font-awesome/3.2.1/css/font-awesome.css" rel="stylesheet">
        <link rel="stylesheet" type="text/css" href="css/menu-style.css">
        <script type="text/javascript">
            $(function() {
                var showmenu = $('#showmenu');
                menu = $('nav ul.nav');
                menuHeight = menu.height();

                $(showmenu).on('click', function(e) {
                    e.preventDefault();
                    menu.slideToggle();
                });
            });

            $(window).resize(function() {
                var w = $(window).width();
                if (w > 320 && menu.is(':hidden')) {
                    menu.removeAttr('style');
                }
            });
        </script>