JSF Library problems

Hi

I have a project that I began in Netbeans 6.0, now I have Netbeans 6.1 and the project work fine but if I want to include an jsf 1.2 object in some page, I can't work with this new objects in the jsp file.

Can I work with the jsf 1.1 library in Netbeans 6.1? How can I configure this?
or
Can I use both types of objects (1.1 and 1.2) in the same page?

Thanks