Iframe logout issue

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ASP.NET

hi,

In my one page, i put iframe(client side) in my page (details.aspx). I am changing iframe source from my javascript function. when session timeou occure, my page which shows in iframe is redirect to login page. I need to redirect details.aspx to login.aspx.

I am using custom role management in my site. I tried to call below code. but javascript can't call at that time.

protected void Page_PreInit(object sender, EventArgs e)
{
    if (HttpContext.Current.Session["AccountID"] == null)
    {
        ScriptManager.RegisterStartupScript(this, this.GetType(), "redirect", "parent.location='login.aspx'", true);

    }
}

can anyone had face this problem? any proper solution for this problem?