<html xmlns="http://www.w3.org/1999/xhtml">
<head id="Head1" runat="server">
<title></title>
</head>
<body>
<form id="form1" runat="server">
<asp:ScriptManager ID="ScriptManager1" runat="server" />
<asp:TextBox ID="txtDate" runat="server" />
<asp:ImageButton runat="server" ID="imgPopup" ImageUrl="~/Images/Calendar.png" />
<cc1:CalendarExtender ID="CalendarExtender1" OnClientDateSelectionChanged="DateSelectionChanged"
runat="server" TargetControlID="txtDate" PopupButtonID="imgPopup" />
<script type="text/javascript">
function DateSelectionChanged(e) {
var today = new Date();
var dob = e.get_selectedDate();
var months = (today.getMonth() - dob.getMonth() + (12 * (today.getFullYear() - dob.getFullYear())));
alert("Your age: " + Math.round(months / 12));
}
</script>
</form>
</body>
</html>
