This is Mini Pomodoro Timer wirtten in JavaScript.
http://www.collindo.com/mini_pomodoro/
Pomodoro Technique is a technique for productivity developed by Francesco Cirillo.
Work 25 minutes and rest 5 minutes, and after 4 times repeat, take 15 minutes rest.
(This code doesn't support 15 minutes break.)
For more information
HOME -The Pomodoro Technique®