Support mobile devices

[nhoening]

This script was never intended to work in mobile devices. To fix that, we'd probably need something like jquery mobile. I'd need help on implementing and testing that as I don't have time or the devices to test.

In the meantime, there is a hack with which to turn off the constant repositioning which makes the script difficult on mobile devices (see popup-ioshack.js). Maybe that should become part of the regular script anyway.

[nhoening]

The refactored code should not need a hack anymore to prevent difficulties on mobile devices, I believe ...