Layers that move up when user scrolls down

I am not sure what the technical term is but I want to put functionality in a website like that used on http://ift.tt/1xU4Pck. Specifically the way the section entitled Our Process 4 moves over a stationary back ground.

Also want to learn how to use fuctionality like on http://ift.tt/uPs7Rd where panels (for lack of a better word) come up and "stack" on top of other panels.

The right name for either technique or a link to a tutorial would be greatly appreciated.

Thanks...

Layers that move up when user scrolls down

from HTML & Website Design http://ift.tt/1qUIdvx
via IFTTT
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