You may choose to watch the introductory video by clicking on one of the images to the right, either in MP4 or Flash file format. A small popup window will appear on the left.

For the uninitiated, just choose one, if this doesn't work on your computer, use the other.

Due to the large content of video files on this site, movie file size has been compressed to be as small as possible with minimum loss of audio/visual quality.