title: jQuery event when user inactive or very active
body: <p>I'm looking for a jQuery script that will fire by inactive or very active visitors.</p>
  
  <ul>
  <li>when the user stops moving his mouse</li>
  <li>when the mouse goes out of browser</li>
  <li>if he has scrolled half the page</li>
  <li>when he scrolls up</li>
  </ul>
  
  <p>Is that possible and is it ready?</p>