$(document).ready(function () {
        var idleState = false;
        var idleTimer = null;
        $('*').bind('mousemove click mouseup mousedown keydown keypress keyup submit change mouseenter scroll resize dblclick', function () {
            clearTimeout(idleTimer);
            if (idleState == true) {
                $("body").css('background-color','#fff');
            }
            idleState = false;
            idleTimer = setTimeout(function () {
                $("body").css('background-color','#000');
                idleState = true; }, 2000);
        });
        $("body").trigger("mousemove");
    });