I suppose as an alternative you could create an image (gif) that is animated showing a count down timer and use a meta tag to redirect if the time has elapsed (i.e. a 10 second gif animation)
Then you set the meta tag redirect to the same time as the animated timer.
You could also look into Flash. This is what I have used in the past for timers and other such animations.
Problem is it is expensive to get a copy if you don’t already have a copy so this more than likely won’t be an option for you, but just incase I figured I would throw it out there.