Is it possible to open particular version of browser using Watir?

Dear all:

I installed Utilu Firefox Collection which has all the versions of the Firefox. After installation when I run my Watir script then FF version 2 is getting opened and my scripts are not working.

My question is, is it possible to open particular browser version using Watir? I am using Watir-webdrivers.

Thanks and Regards,
Amit