Alteration to JS script

I have a DHTML/javascript script that I need altered slightly. This script is setup to countdown from a set number to 0 (i.e. from 100 to 0). It does that at a speed of X ( a value I set). Unfortunately, the speed stays exactly the same when counting down. What I want is the script modified so that the countdown is more random. Where one "tick" of the counter might happen 1 second after the last tick, then the next "tick" might happen 3, 4, or 5 seconds after the previous, then two "ticks" might happen almost back to back, etc. Possibly setting an avg. click countdown would work, or setting a countdown speed range (i.e. from .3-10 seconds). I'm in a hurry so I would want this as quickly as possible. ## Deliverables 1) Complete and fully-functional working program(s) in executable form as well as complete source code of all work done. 2) Deliverables must be in ready-to-run condition, as follows (depending on the nature of the deliverables): a) For web sites or other server-side deliverables intended to only ever exist in one place in the Buyer's environment--Deliverables must be installed by the Seller in ready-to-run condition in the Buyer's environment. b) For all others including desktop software or software the buyer intends to distribute: A software installation package that will install the software in ready-to-run condition on the platform(s) specified in this bid request. 3) All deliverables will be considered "work made for hire" under U.S. Copyright law. Buyer will receive exclusive and complete copyrights to all work purchased. (No GPL, GNU, 3rd party components, etc. unless all copyright ramifications are explained AND AGREED TO by the buyer on the site per the coder's Seller Legal Agreement). ## Platform .js Must work with all main browsers (i.e. 6 and 7, NS, Opera, FF, etc.)