Pupcontrolextender for login

[exploreSPUL]

Hi,
Im trying to use popupcontrolextender in my asp.net project my code is as follows:

'The targetcontrol which will raise the popupextender

<asp:HyperLink ID="HyperLink1" runat="server">Sign in</asp:HyperLink>

'Panel which will appear in popup

<asp:Panel ID="loginPanel" runat="server" style="display:none;border-color:Red;">
           <div style="border-color:Red;display:block">
       Hi, this is trial of popup control extender control provided by ajax control toolkit.
       
        </div>
        </asp:Panel>

'pop up extender conrol itself

<cc1:popupcontrolextender ID="PopupControlExtender1" runat="server" 
                 PopupControlID="loginPanel" TargetControlID="Hyperlink1">
        </cc1:popupcontrolextender>

after writing this much code im facing the problem that after clicking on sign in
i jst get the text i.e.
" Hi, this is trial of popup control extender control provided by ajax control toolkit."

and not the pop up layer at all

Please help me out

Thanks in advance.