<html>
<head>
<title>Comment Node Example</title>
</head>
<body>
<div id="myDiv"><!-- A comment --></div>
<input type="button" value="Get Comment" onclick="getComment()">
<script type="text/javascript">
function getComment(){
var div = document.getElementById("myDiv");
var comment = div.firstChild;
alert(comment.data);
}
</script>
</body>
</html>