html5 - How do you achieve this "scrolling and changing multiple background picture" effect? -

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i looking @ html5 website, http://www.danhigbie.com, , found "background image's scrolling" fascinating. looked through javascript found no code changing background image.

save webpage disk , play around files better.js , better.cs. background scrolling being done in better.js file changing css classes (which defined in better.css)


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