Creat a top menu like on WPMUDEV.org

Hi,

I am currently testing Studio Theme with BuddyPress, and want to know if it is possible to move the login (the sliding login) to the top right corner above the header. (can this function be added to other themes, so the sliding login can be used)

And how to add a top menu like on WPMUDEV.org, and use WordPress's Menu to arrange the items in the top menu.

Thanks,

wmv