I am building a website that serves desktop and mobile versions of the site. Currently, I have 2 separate projects - one that uses the ext-4 library for desktop and the other uses touch-2. I am using the MVC approach, so many of my models, stores, and other classes cross-over.

My questions are:
1) Should I use an index.html / app.js and mobile.html / mobile.js entry points and use some kind of mobile detection to route them to the right page?
2) Does Touch have a modded version of Ext JS baked in, or is Ext JS an unmodded subset of Touch?

Thanks for any help or experience.