Mine

<?php
header("Pragma: no-cache");
header("Cache-Control: no-store, no-cache");
?>
<html>
<head>
<title>AJAX Example</title>
<script language="JavaScript">
function createRequestObject() {
    var ro;
    var browser = navigator.appName;
    if(browser == "Microsoft Internet Explorer"){
        ro = new ActiveXObject("Microsoft.XMLHTTP");
    }else{
        ro = new XMLHttpRequest();
    }
    return ro;
}

var randynum = Math.floor(Math.random()*999999);
var http = createRequestObject();

function sndReq() {
    http.open('get', 'rpc.php?id=' + randynum);
    http.onreadystatechange = handleResponse;
    http.send(null);
}

function handleResponse() {
   var response = http.responseText;
   document.getElementById('foo').innerHTML = response;
}
</script>
</head>
<body onload="setInterval('sndReq()', 1000);">

  <h1><u> AJAX Example </u></h1>
  <div id="foo"></div>

</body>
</html>