title: How can I achieve this background scroll effect?
body: <p>I really like the way each background section overlaps each other which scrolling down. I have seen it done a lot:
  here is the link : <a href="http://www.soleilnoir.net/believein/" rel="nofollow">http://www.soleilnoir.net/believein/</a></p>
  
  <p>Any ideas how to achieve the similar effect? </p>
  
  <p>Thanks</p>