Create Element Dinamically

<!DOCTYPE html>
<html>
<head>
<title>||Working with elements||</title>
</head>

<body>
<div id='org_div1'> The text above has been created dynamically.</div>
</body>
<script>
document.body.onload = addElement;
var my_div = null;
var newDiv = null;
function addElement () {
  // create a new div element
  // and give it some content
  var newDiv = document.createElement("div");
  var newContent = document.createTextNode("Hi there and greetings!");
  newDiv.appendChild(newContent); //add the text node to the newly created div.
  // add the newly created element and its content into the DOM
  my_div = document.getElementById("org_div1");
  document.body.insertBefore(newDiv, my_div);
}
</script>
</html>