title: Javascript unload page condition
body: <p>I am using the following code to prompt the user that if he left the page he can't come back. Things happened that i want to redirect the page using setTimeout function after a specific time. I want to disable checking for user leaving the page when the automatic redirection starts.</p>
  
  <pre><code>&lt;script language="javascript" type="text/javascript"&gt;
          needToConfirm = true;
          window.onbeforeunload = askConfirm;
  
          function askConfirm(){
              if (needToConfirm){
                  return "Please note that you might not be able to come back and watch the movie again.";
                  }
              }
      &lt;/script&gt;
  </code></pre>