Sorry about the minified URL but the site is totally harmless, the last Forum I was on had a rule in place to minified urls.
What I’m trying to do is recreated the Header Parallax effect that got 2 fullscreen parallax’s with callout buttons before showing the main content. I am also trying to match the scroll speed. This one seems to use inline styles for the image tags and container, while inspecting I was not able to locate the Javascript that creates the effect.