Apply WPTouch Pro to Specific Browser Sizes

Hello!

Does anyone know if there is a way to call for WPTouch content and css based on browser size (rather than custom user agents for specific devices)?

I am currently using the CMS theme, which is not tablet-supported.

I’m okay with using my desktop theme for tablets (in fact, I’d prefer this), as long as the browser size is greater than 768px. If the browser size is smaller than 768px, I’d like to activate WPTouch content.

If the same device is used in landscape mode that is greater than 768px, I’d prefer the desktop theme to be viewed.

Is this too tall of an order? Or is there some way this can be done?

Thank you!
Sharon