hello to every one

I have following code and it simple example of timer

Code:
<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="Paper.aspx.cs" Inherits="JQueryAjax.Paper" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
    <title>Untitled Page</title>
    <script type="text/javascript">
    
    function myFunction()
{
setTimeout(function(){alert("Hello")},3000);
}

    </script>
</head>
<body>
    <form id="form1" runat="server">
    <div>
    <p>Click the button to wait 3 seconds, then alert "Hello".</p>
<button onclick="myFunction()">Try it</button>

    </div>
    </form>
</body>
</html>
and it should appear alert after 3 seconds but this does not happening .. any help