The following link is a [url=http://www.phy.ntnu.edu.tw/demolab/swf/shm1.swf]complete step by step ejs tutorial[/url].
It is a flash swf file with file size (6.9M Byte)
You can download it and view it over and over again!
[flash=600,400]http://www.phy.ntnu.edu.tw/demolab/swf/shm1.swf[/flash]