Typical Ajax update

Hi All,

I have:

Code:

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                    <asp:UpdatePanel id="upnlButtons" runat="server" UpdateMode="Always">
                        <ContentTemplate>
                            <asp:Button ID="btnOk" runat="server" Text="OK" Width="60px" OnClick="btnOk_Click" OnClientClick="javascript:window.moveTo(200,0); window.resizeTo(1000,1100);" TabIndex="4"/>&nbsp;&nbsp;
                            <asp:Button ID="btnCancel" runat="server" Text="Cancel" OnClientClick="javascript:window.close()" TabIndex="5" />
                        </ContentTemplate>
                    </asp:UpdatePanel>
                   
                    <asp:UpdateProgress ID="upprButtons" runat="server" AssociatedUpdatePanelID="upnlButtons">
                        <ProgressTemplate>
                            <asp:Label ID="Message" Text="Please Wait..." runat="server"></asp:Label>
                        </ProgressTemplate>
                    </asp:UpdateProgress>

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which works, but now I want to change my 'Please Wait' Label so that the form goes opace with a gif. Can anyone show me how