Notify a user who has minimized a window when a message or event has arrived. The blur/focus is to ensure that the javascript message is not fired when a user is on the screen, to minimize annoyances of closing the popup window.

Javascript Notify

var inFocus = true;
$(window).blur(function(){
    inFocus = false;
});
$(window).focus(function(){
    inFocus = true;
});

setTimeout(function(){
    if (!inFocus) {
        alert('New Message!');
    }
}, 6000);