Toggle opacity with a keyboard shortcut?

[Tassilo Horn]

Hi all,

I frequently have the situation, that I switch between 2 windows
hundreds of times, because one overlaps the other and I cannot use
kwin's tiling feature, cause my resolution is too small.  For example, I
edit LaTeX code in emacs and after texing, I want to review the
resulting PDF that is already open in Okular.

So now, I use the Alt-TAB window switching, but that's not really a good
solution.

What I would really like to have is something like this:

  I press Meta+O and the currently focussed window changes its opacity
  to 20%.  When I release the key, the opacity changes back to whatever
  it was before.

Is that possible?  If the press/release is not feasible, a simple
toggle, where I would click Meta+O twice would also be ok...

Thanks for any hint!
Tassilo
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