That would require major changes in your theme files. See how @sbrajesh at BuddyDev help others do this http://buddydev.com/forums/topic/ajax-tabs
DISCLAIMER – you’d need to update some deprecated or revised template tags/functions.
Wow @mercime, I’d need a professional to do all that for me! I’ll go read the link you sent to me. Thanks!
Just to mention here, I worked on the concept later on the suggestions of Bowe and built a child them which you can find here. It is compatible with bp 1.5+
https://github.com/sbrajesh/bp-default-ajaxed-profile-tab