Alternative/Addition to using a CAPTCHA

I was reading the current tread on CAPTCHA and possible cracks and I thought maybe I'd throw this out to the group to see what you think. Recently I saw a forum where in order to post you first had to click on a div that was placed at a random location on the page, it read something like, "Click here if you are human". I was thinking that maybe you could put together a system that looks something like this: http://people.aapt.net.au/JComerford/ClickMe.htm I was thinking you could use it in a couple of ways: 1) As a replacement to a CAPTCHA image 2) When you click the image a CAPTCHA image is loaded into the 'Click Me' container The main problem is how to tell the server that the div has been clicked, in a way that can't be simulated. I am not an expect with either JS or PHP, but maybe some of the bigger brains out there could throw in their 2 cents...... JC