add timer plugin to wordpress site

I need the plugin to allow me to add a countdown timer to each individual page. so that when the page loads I need there to be a clock that counts down from for example 60 seconds to 0 then when it hits 0 I need a link to appear so that the person can click "next" to go the next page. The purpose of the timer is so that the person has to stay on each page for a certain amount of time before continuing on to the next page. this is very similar to how rapidshare works for non members there is a countdown before you can download your file. please do not place a bid for more then $100 because you will not be chosen