var userIdMessageFont = document.getElementById("userIdMessageFont");
var messageElement = document.createTextNode(message);
if (userMessageElement.childNodes[0]) {
// update the elements
userIdMessageFont.replaceChild(messageElement, userIdMessageFont.childNodes[0]);
} else {
// create the new elements
var fontElement = document.createTextNode("font");
fontElement.setAtribute("id", "userIdMessageFont");
fontElement.setAtribute("color", "red");
userMessageElement.appendChild(fontElement);
fontElement.appendChild(messageElement);
}
}
</script>
<body>
<div id="userIdMessage"></div>
</body>
