<asp:ScriptManager ID="ScriptManager1" runat="server">
        </asp:ScriptManager>
    <asp:UpdatePanel ID="UpdatePanel2" runat="server" UpdateMode="Conditional" >   
        <ContentTemplate>   
            <asp:Timer ID="Timer1" runat="server" ontick="Timer1_Tick" Interval="5000" Enabled="true">   
        </asp:Timer>   
        </ContentTemplate>   
    </asp:UpdatePanel>    
        <asp:UpdatePanel ID="UpdatePanel1" runat="server" UpdateMode="Conditional">   
        <ContentTemplate>   
            <cc1:popupwin id="pw" runat="server" 
                DragDrop="False" Height="109px"    
                Width="175px" AutoShow="true"> </cc1:popupwin>   
        </ContentTemplate>     
        </asp:UpdatePanel> 

protected void Timer1_Tick(object sender, EventArgs e)
    {
        DataSet ds = AccessDAL.Books_hotel.Books_Tanchu(0, 0);
        if (ds.Tables[0].Rows.Count > 0)
        {
            pw.Title = "通知";
            pw.Message = "您好，当前您有留言信息未读。<a href=\"Books/books_list.aspx?page=31\" target=\"mainFrame\">点击进入</a>";
            ScriptManager.RegisterStartupScript(this.UpdatePanel1, this.UpdatePanel1.GetType(), "msg", "pwespopup_winLoad();", true); 
            this.UpdatePanel1.Update();   
        }
    }

protected void Page_Load(object sender, EventArgs e)
    {
        if (!Page.IsPostBack)
        {

        DataSet ds = AccessDAL.Books_hotel.Books_Tanchu(0, 0);
        if (ds.Tables[0].Rows.Count > 0)
        {
            pw.Title = "通知";
            pw.Message = "您好，当前您有留言信息未读。<a href=\"Books/books_list.aspx?page=31\" target=\"mainFrame\">点击进入</a>";
        }
        else {
            pw.AutoShow = false;
        }        }
    }