BeejiveIM question!

Hey guys!
I want to use BeejiveIM Messenger/JiveTalk over WiFi when I'm at home and over 3G/2G/EDGE when I'm not in a WiFi Network..(because I have 200MB per month only for data)...what do I have to set up in the Beejive Options?
Is the option "WiFi prefered" the right choice? I mean, does JiveTalk change from 3G to WiFi as soon as i enter a WiFi Network when I set up "WiFi prefered"?

Thanks