
<?php
function get_message()
{
    return "Hello world! It is ".date("r");
}
if ( isset($_GET["NOW"])){
        sleep(5);
    header("Cache-Control: no-cache, must-revalidate");
    header("Content-type: text/plain");
    echo get_message();
} else { ?>
<html>
<head>
    <title>Hello world</title>
    <!-- Javascript goes here -->
        <script type="text/javascript">
        <!--
       var httpObj=null;
           function OnLoad()
       {
        document.getElementById("action").href="javascript:Update()";
           }
           function Update()
           {
                if (httpObj != null) return;
                document.getElementById("data").innerHTML = "Loading";
                httpObj = NewHTTP();
                httpObj.open("GET","?NOW",true);
         httpObj.onreadystatechange = OnData;
        httpObj.send(null);
       }
       function NewHTTP()
       {
         try {
           return new XMLHttpRequest();
            } catch (e) {
            return new ActiveXObject("Microsoft.XMLHTTP");
        }
           }
       function OnData()
       {
        if (httpObj.readyState==4){
           m = document.getElementById("data");
           if (httpObj.status ==200) {
            m.innerHTML = httpObj.responseText;
              } else {
            m.innerHTML = "Error loading date and time.";
           }
           httpObj = null;
        }
        }
    -->
    </script>

</head>
<body onload="OnLoad();">
    <div id="data">
        <?
        if (isset($_GET["NOW-INLINE"]))
        echo get_message();
        else echo "Press Go";
            ?>
        </div>
        <a href="?NOW-INLINE" id="action">Go</a>
</body>
</html>
<?php } ?>