var sessPollInterval = 30000;    //How frequently to check for session expiration in milliseconds?
var sessExpirationMinutes = 25;  //How many minutes the session is valid for?
var sessIntervalID;
var sessLastActivity;

function GetExpirationMinutes() {
    sessExpirationMinutes = 25;
}

function InitSession() {
    sessLastActivity = new Date();
    sessSetInterval();
   
    $(document.body).bind('mousemove keydown click', sessKeyPressed);
}

function sessSetInterval() {
    sessIntervalID = setInterval('sessInterval()', sessPollInterval);
}

function sessClearInterval() {
    clearInterval(sessIntervalID);
}

function sessKeyPressed(ed, e) {
    sessLastActivity = new Date();
}

function sessLogOut() {
    window.location.href = 'EMSLogin.aspx?Logout=true';
}

function sessInterval() {
    var now = new Date();
    var diff = now - sessLastActivity;   //Get differneces in milliseconds
    var diffMins = (diff / 1000 / 60);   //Get differences in minutes

    sessExpirationMinutes = GetExpirationMinutes();

    if (diffMins >= sessExpirationMinutes) {
        sessLogOut();
    }
}