Its impossible. Give it up.
Even if you thought you coule do it with any kind of web script it doesn't work. As long as your browser isn't the active window you could use the normal PrintScreen button.
As far as I know it can only be done with javascript which you can disable in a browser or if you use mozilla you can just disable it for certain pages or websites.
There's always programs like hypbersnap or quiccsnap that you can hotkep any button say like the "1" button to take a screen shot of your desktop or avtive window.
So don't even bother thinking you can get this to work.
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