Nothing special, just something I knocked up quickly. I took inspiration from the stock calculator that comes with the HTC Hero (running Android 2.1) .
Yeah, alert boxes aren't great I admit. I was aiming for the bare minimum of functionality but I could perhaps add nicer popups using script. It detects changes in browser window size and tries to redraw the button pad accordingly; and so should work well on mobile screens too though there are some width issues on iPod Touch.
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