title: scroll div depending on mouse position. Optimisation help?
body: <p>I have this javascript code that scrolls a div depending on the mouse position.</p>
  
  <p>Ive got the code working, the problem is its a bit jittery. I was wondering if anybody could give me advice on how to optimise it so it runs smoothly!</p>
  
  <p>To view the code please visit my jsfiddle:</p>
  
  <p><a href="http://jsfiddle.net/ENhwT/3/" rel="nofollow">http://jsfiddle.net/ENhwT/3/</a></p>