Chaining Registration, Login, and return to starting point

Effective Chinese offers Mandarin courses to adults, each course is described on a course page. If the user wants to register for the class they must first become members of the site and login, I am using Profile Builder to register the students, and automatically open a logon screen so they can login painlessly. So far so good! But I would like to have them return directly to the course page for a purchase after logging in. Is there any way chain these events. Thanks! -Eric