Feb 3 notes

 * go over homework; see where you folks are

 * another example: /on-campus/tpj2/scoreboard.pl; 

 * mention event issues from TPJ

 * start to discuss drawing pictures in Canvas object

   * coord systems
   * colors
   * pen/line model
   * polygons
   * recursion

   * /on-campus/tpj2/mow.pl