Login/register plugin for BuddyPress and Multisite

Hi everybody! I am looking for a login/register plugin that will work with BuddyPress and Multisite. I would like the user to be able to login or register via a popup from all pages of the network. If there is no popup plugin for the job, I am fine with just creating a page within the theme for each site where the user can login or register. I have tried Theme My Login, but it did not work well with BuddyPress.