jQuery: Fire Event When User is Idle

gistfile1.js

idleTimer = null;
idleState = false;
idleWait = 2000;

(function ($) {

    $(document).ready(function () {

        $('*').bind('mousemove keydown scroll', function () {

            clearTimeout(idleTimer);

            if (idleState == true) { 

                // Reactivated event
                $("body").append("<p>Welcome Back.</p>");
            }

            idleState = false;

            idleTimer = setTimeout(function () { 

                // Idle Event
                $("body").append("<p>You've been idle for " + idleWait/1000 + " seconds.</p>");

                idleState = true; }, idleWait);
        });

        $("body").trigger("mousemove");

    });
}) (jQuery)