Code:
<&#37;@ Page Language="VB" AutoEventWireup="false" CodeFile="Default.aspx.vb" Inherits="_Default" %>

<!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" language="javascript">
    function toggle()
    {
    if(document.getElementById('img1').src=="img/Autumn Leaves.jpg")
    {
    document.getElementById('img1').src="img/Creek.jpg";
    setTimeout ( "setAnotherImage()", 2000 );
    }
    }
    function setAnotherImage()
    {
    if(document.getElementById('img1').src=="img/Creek.jpg")
    {
    document.getElementById('img1').src="img/Autumn Leaves.jpg";
    setTimeout ( "toggle()", 2000 );
    }
    }
    </script>
</head>
<body >
    <form id="form1" runat="server">
    <div>
        <img id="img1" src="img/Autumn Leaves.jpg" alt="Image cannot be displayed" height="400" width="400"/>
        <asp:Button ID="Button1" runat="server" Text="Button" OnClientClick="toggle()" />
    </div>
    </form>
</body>
</html>
the images are not toggling on the button click

please help