<script>
function updateContent() {
var container = document.getElementById("content-container");
var xhr = new XMLHttpRequest();
xhr.open("GET", "include/dj.php", true);
xhr.onreadystatechange = function() {
if (xhr.readyState === XMLHttpRequest.DONE) {
if (xhr.status === 200) {
container.innerHTML = xhr.responseText;
}
}
};
xhr.send();
}

setInterval(updateContent, 20000);
</script>