This is a slightly modified demo based on this article "Tracking Clicks, Building a Clickmap with PHP and jQuery".
You can add the lines below to any webpage to have clicks recorded and press the S-key to view the clickmap assoicated with that page. Furthermore, you can track individual responses by adding a unique tag to each page: add a question-mark plus a unique identifier to the URL to track individual responses: example.
Key codes are:
s: show clickmap (toggle) d: delete clickmap (only for current identifier)