title: Twitter-Bootstrap affix
body: <p>I am trying the affix feature on twitter-bootstrap, what this js method does, cause as i see it just puts the element choosed to:</p>
  
  <p><code>position:fixed;</code> </p>
  
  <p>Or i'm mistaking and it also controls the element <code>window offsets TOP,BOTTOM,LEFT,RIGHT ..</code> ?</p>
  
  <p>The main method i'm referring to is the :</p>
  
  <pre><code>$('.element').affix();
  </code></pre>
  
  <p>thanks</p>