There are no validated online TEFL courses, however you might want to contact this company
http://bridgelinguatec.com/TeacherTrain ... /home.html
In the past they offered a Hybrid course (online sessions followed by teaching practice at a location that suits you. I am not sure if this option is still available. This way you can do the course in 2 weeks instead of 4.
The best current options are CELTA and TRINITY.