title: alert box automatic disappear
body: <p>I'm using Bootstrap and want to realize the following:<br>
  having a kind of an alert box which disappears after a short period of time automatically. I have something special in my Imagination which I saw often but can't find at the moment. I think the standard bootstrap alert (<a href="http://getbootstrap.com/javascript/#alerts" rel="nofollow">http://getbootstrap.com/javascript/#alerts</a> and <a href="http://getbootstrap.com/components/#alerts" rel="nofollow">http://getbootstrap.com/components/#alerts</a>) is not the right thing, is it? Because I want something to just "appear on top of something", so not as content of the page, if you know what I mean.</p>
  
  <p>So it should just show a short "success information" when entering the page, and then it should disappear again. Or do I missunderstand Bootstrap alert wrong and it's exactly what I'm searching for? If yes, how do I use it? Where do I have to put that "div"?  </p>