modal popup appears on every tick of timer in asp

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ASP.NET

i have a webpage where i am using asp timer with its tick event along with modal popup for some information to display on page load of a page . now my problem is when the page gets loaded the timer tick event is called and pop up message is displayed from ajax modal pop up extender .but when i click cancel button of popup the popup reappears without getting closed. is this beacuase of timer tick or something else pls help me out with this





Here is my code :

<asp:Content ID="Content2" ContentPlaceHolderID="ContentPlaceHolder1" Runat="Server">
<div style="removed:absolute; removed 266px; removed 293px;">
<asp:panel  class="popupConfirmation" id="DivConfirmation5" 
	 runat="server">
   <div class="popup_Container">
        <div class="popup_Titlebar" id="Div14">
            <div class="TitlebarLeft">
              Message</div>
            <div class="TitlebarRight" önclick="$get('ButtonDeleteCancel').click();">
            </div>
        </div>
        <div class="popup_Body">
            <p>
             <asp:Label ID ="lblrecharge" runat="server">      <%--<asp:HyperLink  ID="hyplogin" runat="server"  NavigateUrl="~/RechargeOption.aspx">RECHARGE NOW</p>--%>
        </div>
        <div class="popup_Buttons">
          <%--  <asp:Button ID="RechargeNow" runat="server" OnClick="RechrgeNowC()" Text="Recharge Now" />--%>
            <input id="RechargeNow" type="button" value="Recharge Now" style="display:none;" />
              <asp:Button ID="re" runat="server" PostBackUrl="~/RechargeOption.aspx" Text="Recharge Now" Height="30" />    
            <input 
                id="NotNow" type="button" value="Not Now"  önclick="return NotNow_onclick()" style="height:30px;" /></div>
    </div>

       <%-- --%>
       <asp:ScriptManager ID="sc" runat="server">
      <cc1:ModalPopupExtender ID="mpe5"   runat="server" 
TargetControlID="Button3"
    PopupControlID="DivConfirmation5"
    BackgroundCssClass="ModalPopupBG" 
    DropShadow="true" 
    OkControlID="RechargeNow" 
   
    CancelControlID="NotNow"
    PopupDragHandleControlID="Panel3" >
     <input 
                id="Button3"   runat="server" type="button"  style="display:none;"  />
    
    <asp:Button ID="Button2" runat="server" Text="Button" Visible="false"  />
    </div>
 
 
    <asp:Timer ID="tm" runat="server" Enabled="true" Interval="1000"    OnDisposed="Timer_Disposed" OnTick="Timer_Tick" >

    <asp:UpdatePanel ID="up"   runat="server">
        <triggers>
        <asp:AsyncPostBackTrigger ControlID="tm" EventName="Tick" /></triggers>
        
        <div style="removed:absolute; removed 240px; removed 470px; height: 50px; width: 320px;">
   
            
           <asp:Label ID="lbtime" runat="server" Font-Bold="true" ForeColor="Black" >
    <br />
<asp:Label ID="lbtime0" runat="server" Font-Bold="true" ForeColor="Black" >

         
            </div>
            
             


<div style="position:absolute; top: 310px; left: 440px; width:420px; height: 400px;"
 
        id="pic1"   visible="true"
          runat="server">

when i click not now button the modal popup reappears .here you can see i am running a lebelled asp timer

code behind is as follows

 protected void Page_Load(object sender, EventArgs e)
    {
        try
        {

            lblrecharge.Text = "HELLO " + Request.Cookies["USERNAME"].Value + " YOU HAVE " + Request.Cookies["pointsreq"].Value + " LESS POINTS IN YOUR ACCOUNT TO PROCEED RECHARGE YOUR ACCOUNT ";
 
            try
            {
               mpe5.Show();
            }
            catch (Exception)
            { }

          //  Response.Write("<script>alert('HELLO " + Request.Cookies["USERNAME"].Value + " YOU HAVE " + Request.Cookies["pointsreq"].Value + " LESS POINTS IN YOUR ACCOUNT TO PROCEED RECHARGE YOUR ACCOUNT');</script>");
            pic1.Visible = true;
            tm.Enabled = true;
}

catch(Exception ex){}
}



protected void Timer_Tick(object sender, EventArgs e)
  {
//Timer tick event handling

}