This has been covered in the mulit media fourm a few time.
No easy way to do it and get good quality. Problems with
different frame rates and flickering.
The easest way is to show the film in a dark room and video with a video camera, this also has the lowest quality.
The best way is to ues a service like this but it cost money. John
http://www.filmtransfer.com/super-8mm-16mm-film-transfer-conversion.asp