Display Theme According To Resolution?

[Gemma]

Does anyone know of a way to display a theme automatically in accordance to the user's screen resolution?

I had some code before which stopped certain elements of my theme appearing on lower resolution screens but was never able to suss out how to load a theme automatically if, for example, your monitor resolution was 1600*900 or higher.

I'm not even sure if it is possible - if I remember correctly my attempts just caused my index page to loop, constantly trying to load 'theme A' or 'theme B' depending on my resolution setting.