Ok, I'm totally stumped and could really use some help on this one. 

I'm trying to create an AJAX enabled search form similar in function to kayak.com (left side search options trigger a new search url which in turn causes the right side search results to be filtered).  Of course, I'd like to do all of this without a big ugly page refresh.  The kicker is that I've got it working in IE, but not FireFox.  Usually I find that IE is the browser that gives me the most trouble so I'm a little surpised to find that its now Firefox. 

I've broken the page down as far as I can and have left only the offending code.  The problem occurs when ever I have a checkbox within another AJAX Extender control.  In this example, its in a CollapsiblePanelExtender (I've also reproduced it in a TabExtender as well).  Here's what I've got: a checkbox (chk1) in a PanelExtender with Autopostback="true".  The code behind simply, updates the URL by adding the parameter "checked=[    ]".  On Page Load, it checkes the value in the query string, and sets the value of the checkbox.  Pretty simple.

But for some reason it works in IE 7 but not FF2. Firefox does a full screen reload while IE does a nice subtle AJAX update.   Any help would be much appreciated!!!!!

Thanks!!!!

 Here's the code:

<%@ Control Language="VB" AutoEventWireup="false" CodeFile="ctlNavStatic.ascx.vb" Inherits="YourCompany.Modules.Rentals.ctlNavStatic" %>
<%@ Register Assembly="AjaxControlToolkit" Namespace="AjaxControlToolkit" TagPrefix="cc1" %>
<asp:Panel ID="TitlePanel1" runat="server" CssClass="collapsePanelHeader">
    <asp:Image ID="cpeImage1" runat="server" ImageUrl="images/expand_blue.jpg" />
    <asp:Label ID="Title1" runat="server">Group 1</asp:Label>
</asp:Panel>
<asp:Panel ID="ContentPanel1" runat="server" CssClass="collapsePanel">
    <asp:Panel ID="pnl1" runat="server">
        <asp:CheckBox ID="chk1" runat="server" Checked="False" Text="CheckBox1" CssClass="checkbox"
            AutoPostBack="true" OnCheckedChanged="AttributeChanged" />
    </asp:Panel>
</asp:Panel>
<cc1:CollapsiblePanelExtender ID="cpe1" runat="Server" TargetControlID="ContentPanel1"
    ExpandControlID="TitlePanel1" CollapseControlID="TitlePanel1" Collapsed="False"
    TextLabelID="Title1" ExpandedText="Group 1" CollapsedText="Group 1" ImageControlID="cpeImage1"
    ExpandedImage="images/collapse_blue.jpg" CollapsedImage="images/expand_blue.jpg"
    SuppressPostBack="false">
</cc1:CollapsiblePanelExtender>

Imports DotNetNuke
Imports DotNetNuke.Entities.Modules

Namespace YourCompany.Modules.Rentals

    Partial Class ctlNavStatic
        Inherits PortalModuleBase

        Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load

            If Not Page.IsPostBack Then
                If Not Request.QueryString("checked") Is Nothing Then
                    Dim chk As CheckBox = CType(Me.FindControl("chk1"), CheckBox)
                    If Not chk Is Nothing Then
                        If Request.QueryString("checked") = "True" Then
                            chk.Checked = True
                        Else
                            chk.Checked = False
                        End If
                    End If
                End If
            End If

        End Sub

        Public Sub AttributeChanged(ByVal sender As Object, ByVal e As System.EventArgs)

            Response.Redirect(NavigateURL(Me.TabId, "", "checked=" + sender.Checked.ToString), True)

        End Sub

    End Class

End Namespace