Animated Menu - PERPLEXED!

Hi folks

Looking to understand something about the animated menu demos I've been looking through here.  Two GREAT examples I would like to emulate are David Anderson's Animated Menu Navigation and eLEarning.net's Mobile eLearning Design (which was found posted on the community).

HERE'S WHAT I CAN'T FIGURE OUT:

How does the menu come in (presumably on a layer), still showing the content that was just viewed (presumably on another layer)? 

If you put the menu on a layer, it would always show the Base Layer items, unless you've hidden them.  

Despite thread participants asking for the source file, neither author was willing to share.  Can someone please explain how this works?  Really LOVE the idea, but I just can't figure it out by myself!

Thank you!! 

 

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