Multiple version of same app (Mobile)

[eluser]bapobap[/eluser]
Hey all,

I was wondering if anyone had any tips on how best to handle this? I have an app that needs to be available as a normal browser version, iPhone version, XHTML for mobile and finally WML.

All will use the same database but depending on how your accessing the app, you'll get varying levels of comprehensiveness and in some cases will get a slightly different interface.

I started off by detecting what version to provide, then sending the right header and footer accordingly. However, I'm not sure how to handle controllers and views. I'm also using a Universal controller that handles everything which might make things harder.

Should I be using 4 separate copies of CI or is there a smarter way to do this?

Thanks