dvě funkce

        $(document).ready(function () {
            $('button').click(function() {
                var val = $(this).val();
                $.ajax({
                    url: "admin_panel.php",
                    type: "POST",
                    data: {'data': val}
                });
            });
        });
        var timestamp = Number(new Date());
        $('#main_container').load('./data.php?time='+timestamp);
          var refreshId = setInterval(function() {
              var timestamp = Number(new Date());
             $('#main_container').load('./data.php?time='+timestamp);
        }, 5000);