title: Bootstrap 3: Affix navbar fade in and add object
body: <p>1) I would like to fade in / ease in the navbar when user scroll down. Possible with css3 ease-in? </p>
  
  <p>2) Would it possible to add an image (or the text) only in the fixed navbar? For example, on load Logo1 and on scroll Logo 2?</p>
  
  <pre><code>#nav.affix {
  position: fixed;
  top: 0;
  width: 100%;
  border-bottom:1px solid #ccc;
  </code></pre>
  
  <p>}</p>
  
  <p>jsfiddle: <a href="http://jsfiddle.net/5jq88/" rel="nofollow">http://jsfiddle.net/5jq88/</a></p>