AJAX - Absolute for Beginner

index.html

<html>
<title>Simple Ajax</title>
<head>
<script type="text/javascript">
  function loadPage() {
    var xmlhttp = new XMLHttpRequest();
    xmlhttp.open("GET","display.php",true);
    xmlhttp.send();

    xmlhttp.onreadystatechange = function() {
      document.getElementById('display').innerHTML = xmlhttp.responseText;
    }
  }
</script>
</head>
<body>
  <input type="button" value="Display" onClick="javascript:loadPage();" />
  <div id="display"></div>
</body>
</html>


display.php

<html>
<title>Simple Ajax</title>
<head>
</head>
<body>
  <h1>Welcome</h1>
</body>
</html>