// set your timeout period in minutes, minus 1;
// ie: 9 minutes + 1 minute countdown = 10 minute timeout
var timeoutPeriod = 9;

// declare global variables to track the timeout
// and interval timers;
// this allows Javascript to cancel them as necessary
var intervalCountdown;
var timeoutWarning;

function showWarning()
{
  // show the warning divs
  document.getElementById('divTimeOut').style.display = 'block';
  intervalCountdown = setInterval(countDown,1000);
  // start the countdown
}

function countDown()
{
  var divCountDown = document.getElementById('divCountDown');
  var intCount = parseInt(divCountDown.innerHTML) -1;
  // get remaining countdown time, minus 1 second

  if (intCount <= 10)
    {divCountDown.style.color = '#ff0000';}
     // show red text when only 10 seconds remain
  if (intCount >= 0)
    {divCountDown.innerHTML = intCount.toString();}
    // update the countdown div
  else // logout user after 10 minutes
    {__doPostBack('ctl00$lnkTimeOut','');}
    // if your Master page is named something other than
    // "ctl00," change that here; you can also
    // call the "click" event of the button instead
}
function refreshPage(){
clearInterval(intervalCountdown); // stop countdown
clearTimeout(timeoutWarning);
// reset timeout warning to original 9 minutes
timeoutWarning = setTimeout(showWarning,timeoutPeriod * 60000);
var divCountDown = document.getElementById('divCountDown');
divCountDown.style.color = '#000000';
divCountDown.innerHTML = '60'; // reset countdown to 60
// create random number between 0 and 1000
var decRound = Math.round(Math.random()*1000);
var imgRefresh = new Image(1,1);
// change '../keepalive.aspx?id=' based on keepalive.aspx's location
// in relation to your secured pages, ie '/keepalive.aspx?id=' + 
//  decRound.toString(); for a keepalive.aspx page placed in the application root
imgRefresh.src = '/Involve/keepalive.aspx?id=' + decRound.toString();
document.getElementById('divTimeOut').style.display = 'none';
// hide the warning divs
}