SetTimeout - ClearTimeout

var SessionTimer;

function StartSessionTimer()
{
SessionTimer = setTimeout('RedirectToSessionTimedOutPage(),60000)
}

function RestartSessionTimer()
{
clearTimeout(SessionTimer);
StartSessionTimer();
}

function RedirectToSessionTimedOutPage()
{
window.location = '/SessionTimedOut.html'
}

When I load the page and call StartSessionTimer(), I know it works because the page redirects after ten minutes (the value of 60000). However, in certain situations I need to be able to call back to the server with AJAX and then have the timer reset - that's when I call the RestartSessionTimer() function. When I do this, for some reason the ten minute window does not get reset.

To troubleshoot, if I remove the second line in the RestartSessionTimer() function the redirect is getting blocked (as planned). However, when I put the second line back in, the page just redirects as originally called - the SessionTimeout value is never
reset properly.

The code above looks good to me, but for some reason the SessionTimeout var does not get reset in the RestartSessionTimer function; it retains its original value?