Protected Sub Imgbtnesci_Click(sender As Object, e As System.Web.UI.ImageClickEventArgs) Handles Imgbtnesci.Click
        ClientScript.RegisterStartupScript(Me.GetType, "closeWindow", "<script type='text/javascript'>GetRadWindow().close('" & ViewState("DirImage") & "')</script>")
    End Sub

                                 <script type="text/javascript">
                                     function GetRadWindow() {
                                         var oWindow = null;
                                         if (window.radWindow) oWindow = window.radWindow;
                                         else if (window.frameElement.radWindow) oWindow = window.frameElement.radWindow;
                                         return oWindow;
                                     }
                                     function Close() {
                                         GetRadWindow().close();
                                     }
                                     </script>