How did they do this?

Hi,

I client asked me to recreate this mask effect found at:
http://www.starwoodspacollection.com/common/Home.aspx

I figured it out by using 2 different images. A clear and a blured one.
I used action script for moving the mask. I was wondering if somebody has an easier solution instead of using 2 images by using one image and apply an action script to automatically blur it.

Thank you in advanced.