Javascript to check for timeout K2 Smartform

<script type="text/javascript">
 var IDLE_TIMEOUT = 60;  var _idleSecondsTimer = null; var _idleSecondsCounter = 0; document.onclick = function() {     _idleSecondsCounter = 0; }; document.onmousemove = function() {     _idleSecondsCounter = 0; }; document.onkeypress = function() {     _idleSecondsCounter = 0; }; _idleSecondsCounter = window.setInterval(CheckIdleTime, 1000); function CheckIdleTime() {      _idleSecondsCounter++;      var oPanel = document.getElementById("SecondsUntilExpire");      if (oPanel)          oPanel.innerHTML = (IDLE_TIMEOUT - _idleSecondsCounter) + "";     if (_idleSecondsCounter >= IDLE_TIMEOUT) {
        window.clearInterval(_idleSecondsCounter);
        alert("Time expired!");
        document.location.href = "logout.html";
    }
}
</script>You will be auto logged out in <span id="SecondsUntilExpire"></span> seconds