function setAlive() {
    setTimeout("keepAlive()", 600000); // every 10 min
}

function keepAlive() {
    $.get(
        "/session.ashx",
        null,
        function (data) {
            //$("#heartbeat").show().fadeOut(1000); // just a little "red flash" in the corner :)
            setAlive();
            //console.log('bip');
        },
        "json"
    );
    }

keepAlive();