Callback on losing window focus

focus-losing-callback.js

document.onfocusout = function (e) {
    if (e === undefined) {//ie
        e = event;

        if (e.toElement == null) {
            //do your action on focus out
        }
    }
};

//other browser
window.onblur = function (e) {
    if (e !== undefined) {
        //do your action on focus out
    }
};

$(window).focus(function () {
    //do your action on focus
});