Create Multiple Popup In AJAX

  <asp:LinkButton ID="lblfake" runat="server" Text=""></asp:LinkButton>

    <cc1:ModalPopupExtender ID="ModalPopupExtender1" runat="server" PopupControlID="Panel1" TargetControlID="lblfake" BackgroundCssClass="modalBackground" BehaviorID="addAttribute1"></cc1:ModalPopupExtender>

            

<asp:Panel ID="Panel1" runat="server" CssClass="modalPopup" Style="display: none;Width: 600px">

                       // Create Panel 1

                       // create Panel 2

</panel>

         panelupdate.Visible = false;

        panelauthor.Visible = true;