upgrading code & support for iOS 6.1

upgrading code & support for iOS 6.1

Hi there

I developed a mobile site using the following libraries:

http://code.jquery.com/jquery-1.6.2.min.js
http://code.jquery.com/mobile/1.0b2/jquery.mobile-1.0b2.min.js

I note that more recent versions of these libraries are now available

http://code.jquery.com/jquery-1.9.0.min.js
http://code.jquery.com/mobile/1.2.0/jquery.mobile-1.2.0.min.js

but when I update my references to use the newer libraries my code is broken.

Is there a migration guide to assist with upgrades?

And on a related topic, is iOS6.1 supported?

cheers
Denby