Add Parallax Scroll to Simple-Catch Header

Hi,

I’ve created a child theme for Simple Catch and am trying to work out how to make a parallax scroll work on the header image, where the text scrolls faster than the header and so overlaps the header. Something like in this example: http://abduzeedo.com/super-easy-parallax-effect-jquery

Here’s a link to my site: bbigwords.com

Thanks in advance!