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Paralax made responsive

I am using this example on Building blocks

http://zurb.com/building-blocks/parallax-site

If I have image defined as a background in class="parallax-background" what is the easiest way to interchange it for mobile/tablet view?

parallaxinterchange

I am using this example on Building blocks

http://zurb.com/building-blocks/parallax-site

If I have image defined as a background in class="parallax-background" what is the easiest way to interchange it for mobile/tablet view?