Many years ago (november 1997 to be exact), I was home sick from work for a few days, and decided to experiment with some of the new browser-side scripting capabilities that were on the leading edge of browser technology at the time. My project was to implement a game of Othello (or Reversi, also known as many other names) entirely in the browser.
Times have changed, and today ActiveX controls are all but dead and Java applets are no longer acceptable for implementing client-side logic. With modern browsers not even including Java by default, my Othello page sat broken and neglected under the tide of progress.
Let me know if you have any trouble using this in your browser!