How to remove the EARTH image background

I found a nice tilecutter applet but it shows the earth background and
I don't see where it's being pulled from, can anyone point it out to
me please? I believe it has something to do with the overlay command
(hybrid option??)

Source code: http://docs.google.com/View?id=dhnr96qq_47f474xzgn

Many thanks!

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