A Small PHP Script

Hello, I need a small PHP script, that is a count down clock. Hours : Minutes : Secounds Timer starts on load of Page 1. When Timer gets to 0 it goes to Page 2. And When the user clicks End (Submit button) the time stops and goes to Page 2. Example and what it to be the same! <[login to view URL]> Sign in as guest, click on the second test, and start test. You will see the timer at the top, counting down from 20 minutes. When you sumbit the question, and goes to the next question the timer continues to countdown, and does not restart! Needs to be the same. Im guessing this uses sessions to remember the time left? Needs to be in PHP and must be able to use in any script, so include file or functions... etc I am hoping that you have one already writen, and just need change some parts to meet my requirements. Thanks