title: Jquery: how to make something fade out when mouse is idle. When mouse moves again, It fadesIn!
body: <p>I have a div called "#top". I would like it to fade out when the mouse is <strong>idle</strong> for 3 seconds.  When the mouse moves again, make it appear (fade, of course)</p>
  
  <p>Does anyone know how to do this?</p>
  
  <p>Thanks a lot.</p>