Image Comparison Slider

Hello, heroes!

I've been tasked with creating a training for our employees regarding a new website that will be replacing an old one... just an orientation course, if you will.

I'm on the way out for the day, but I just thought of a neat idea that I was stumped by and thought I'd drop this off here to see if anyone can crack it.

I was thinking of doing slider comparisons between old and new, similar to:
http://codyhouse.co/demo/image-comparison-slider/

They normally take coding well beyond my knowledge level, but sometimes Storyline has the right tools to fake it. Any ideas?