Javascript - Basic Clock

<!DOCTYPE html>
<html>
<head>
    <title></title>
</head>
<body>
<p id="clock">Clock</p>

<script type="text/javascript">

    function printTime()
    {
        var now = new Date();
        var hours = now.getHours();
        var mins = now.getMinutes();
        var seconds = now.getSeconds();
        document.getElementById("clock").innerHTML = hours + ":" + mins + ":" + seconds;
    }

setInterval("printTime()", 1000);
</script>
</body>
</html>