[OS X Emacs] how to make background transparent?

[Peter Salazar]

Hello,

I'm on Aquamacs 3 and I'm trying to make my background transparent but not
the text.

There's an easy way to make the whole frame transparent:

(set-frame-parameter (selected-frame) 'alpha '(85 85))
(add-to-list 'default-frame-alist '(alpha 85 85))

But this makes the whole frame transparent, including the text. I want only
the frame background to be transparent. Someone on the Emacs Wiki said that
such an implementation would have to be OS-specific. So, does anyone know
how I could do this for OSX?

Thanks!
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