The Fast Click script counts clicks and as Dean stated it does a pretty damn good job! Its very very simple – Ive hacked the script to include a few extra administrative features, but Im sure the base version will suite you fine.
You can track anything that can be hyperlinked and best of all you can filter robots, thus the script provides very accurate stats.
Heres the software in English 
xhttp://www.ftrain.amillo.net/index.html
(remove the x and copy paste)