Need help with resolving AJAX problem...

Hi,

I have the following ajax code (see default.aspx) that's working just fine in all non-production environments, but as soon as I deploy it to Production, I get a javascript error "  'Sys' is undefined " onload of default.aspx. Clicking "yes" to view details about the js error takes me to:

    <script type="text/javascript">
//<![CDATA[
Sys.WebForms.PageRequestManager._initialize('ctl00$CenterMainContent$ScriptManager1', document.getElementById('aspnetForm'));
Sys.WebForms.PageRequestManager.getInstance()._updateControls([], [], [], 90);
//]]>
    </script>

Both environments are using .net 3.5 and have AJAX extensions installed. Both web configs have the lines:
      <add verb="*" path="*_AppService.axd" validate="false" type="System.Web.Script.Services.ScriptHandlerFactory, System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35" />
      <add verb="GET,HEAD" path="ScriptResource.axd" type="System.Web.Handlers.ScriptResourceHandler, System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35" validate="false" />
      <add verb="*" path="*.asmx" validate="false" type="System.Web.Script.Services.ScriptHandlerFactory, System.Web.Extensions, Version=1.0.61025.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" />

Can someone please tell me how to solve this?
Thanks a bunch.

default.aspx:
 
<%@ Page Language="C#" MasterPageFile="~/HomePage.master" AutoEventWireup="true" CodeFile="default.aspx.cs" Inherits="_Default" Title="Untitled Page" %>
<%@ Import Namespace="System.Collections.Generic" %>
<%@ Import Namespace="System.Xml" %>
<%@ Import Namespace="System.Web" %>
<%@ Import Namespace="System.IO" %>
<%@ Import Namespace="System.Data.Common" %>
 
<%@ Register Assembly="AjaxControlToolkit" Namespace="AjaxControlToolkit" TagPrefix="slideshow" %>
 
<asp:Content ID="Content1" ContentPlaceHolderID="CenterMainContent" runat="server">
    
    <asp:ScriptManager ID="ScriptManager1" runat="server" />
    
    <script runat="Server" type="text/C#">
    [System.Web.Services.WebMethod]
    [System.Web.Script.Services.ScriptMethod]
    public static AjaxControlToolkit.Slide[] GetSlides()
    {
        try
        {
            HttpContext context = HttpContext.Current;
            string xlsPath = context.Server.MapPath("~/uploadedFiles/slideshow.xls");
            if (File.Exists(xlsPath))
            {
                /** "HDR=Yes;" indicates that the first row contains column names/headers, not data.
                    "IMEX=1;" tells the driver to always read "intermixed" data columns as text. **/
                string connectionString = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" + xlsPath + ";Extended Properties='Excel 8.0;HDR=Yes;IMEX=1'";
 
                DbProviderFactory factory = DbProviderFactories.GetFactory("System.Data.OleDb");
 
                List<AjaxControlToolkit.Slide> slides = new List<AjaxControlToolkit.Slide>();
 
                using (DbConnection connection = factory.CreateConnection())
                {
                    connection.ConnectionString = connectionString;
 
                    using (DbCommand command = connection.CreateCommand())
                    {
                        command.CommandText = "SELECT ImageFile, ImageTitle, ImageDesc FROM [Slides$] s WHERE LEN(LTRIM(RTRIM(ImageFile))) >= 5 AND LEN(LTRIM(RTRIM(ImageDesc))) > 0 ORDER BY ImageFile";
                        connection.Open();
                        using (DbDataReader dr = command.ExecuteReader())
                        {
                            while (dr.Read())
                            {
                                slides.Add(new AjaxControlToolkit.Slide("uploadedimages/" + dr["ImageFile"].ToString().Trim(), dr["ImageTitle"].ToString().Trim(), dr["ImageDesc"].ToString().Trim()));
                            }
                        }
                    }
                }
                return slides.ToArray();
            }
            return null;
        }
 
        catch (Exception ex)
        {
            throw ex;
        }
    }
    </script>
    
    <div id="slideShowContainer" runat="server">
        <table id="slideShow" border="0" cellpadding="0" cellspacing="0">
            <tr>
                <td>
                    <asp:Image ID="imgSlide" runat="server" ImageUrl="images/slide_Horserace.jpg" />
            
                    <slideshow:SlideShowExtender ID="SlideShowExtender1"
                      AutoPlay="true" ImageDescriptionLabelID="lblImageDescription"
                       Loop="true" NextButtonID="btnNext" PlayButtonID="btnPlay" 
                        PlayButtonText="Play" PreviousButtonID="btnPrevious" 
                        SlideShowServiceMethod="GetSlides" StopButtonText="Stop" 
                        TargetControlID="imgSlide" runat="server">
                    </slideshow:SlideShowExtender>
                </td>
            </tr>
            <tr>
                <td id="slideShowButtons">
                    <asp:ImageButton ID="btnPrevious" runat="server" ImageUrl="images/back_arrowgraphic.gif" ToolTip="Previous slide" />
                    <asp:ImageButton ID="btnPlay" runat="server" ImageUrl="images/pause_arrowgraphic.gif" ToolTip="Pause/Play" />
                    <asp:ImageButton ID="btnNext" runat="server" ImageUrl="images/forward_arrowgraphic.gif" ToolTip="Next slide" />
                    <%-- <asp:Button ID="btnPrevious" runat="server" Text="Previous" />
                    <asp:Button ID="btnPlay" runat="server" Text="Play" />
                    <asp:Button ID="btnNext" runat="server" Text="Next" /> --%>
                </td>
            </tr>
            <tr>
                <td id="slideShowText">
                    <asp:Label ID="lblImageDescription" runat="server" />
                    <br /><br />
                </td>
            </tr>
        </table>
    </div>
</asp:Content>

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