It's done by adding this to the txi:
proceduretype cycle
defaultwidth 256 (width of single frame)
defaultheight 256(height of single frame)
numx 2(both this and numy are for how many columns and rows you want to have)
numy 2
fps 48(how fast it goes through the frames)
The texture would look like this(with the above -along with the two lines to make sure the saber appears right):
http://img.photobucket.com/albums/v635/KomaB1ack/BlueSaberTex.png)
Though it would get a lot more complex for something like a computer panel, if one wanted a lot of detail.
This is what I was referring to, thanks.