Session Time Out Call and Redirect

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ASP.NET

Javascript

session

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I am creating web application using .Net framework 3.5, I implemented asp.net membership (Forms Authentication), Now, What i want is when user session state is inactive then redirect page to Lockscreen.aspx and then user will enter details and continue work. After lot of search I have got something is

Web config
<sessionState mode="InProc"  timeout="2"/>

<authentication mode="Forms">
      <forms defaultUrl="~/Pages/Default.aspx"
          loginUrl="~/Pages/Login.aspx" timeout="2"
          />
    </authentication>

I am configuring session timeout as when session timeout then user should get alert and if user doesn't respond then redirect to lockscreen.aspx

Default.aspx

function SessionExpireAlert(timeout) {
            var seconds = timeout / 1000;
            alert(seconds);
            document.getElementsByName("secondsIdle").innerHTML = seconds;
            document.getElementsByName("seconds").innerHTML = seconds;
            setInterval(function () {
                seconds--;
                document.getElementById("seconds").innerHTML = seconds;
                document.getElementById("secondsIdle").innerHTML = seconds;
            }, 1000);
            setTimeout(function () {
                //Show Popup before 20 seconds of timeout.
                $find("mpeTimeout").show();
            }, timeout - 20 * 1000);
            setTimeout(function () {
                window.location = "LockScreen.aspx";
            }, timeout);
        }

        function ResetSession() {
            //Redirect to refresh Session.
            window.location = window.location.href;
        }

Defualt.aspx.cs

            Response.Cache.SetCacheability(HttpCacheability.NoCache);
            if (!this.IsPostBack)
            {
                Session["Reset"] = true;
                Configuration config = WebConfigurationManager.OpenWebConfiguration("~/Web.Config");
                SessionStateSection section = (SessionStateSection)config.GetSection("system.web/sessionState");
                int timeout = (int)section.Timeout.TotalMinutes * 1000 * 60;
                ClientScript.RegisterStartupScript(this.GetType(), "SessionAlert", "SessionExpireAlert(" + timeout + ");", true);
            }

Now problem is when user session is still active session timeout alert occur's . I don't want that to be happen .Alert should appear when session is expired/timeout.