How to build a clickmap using PHP and jQuery

I’ve found a great article on the topic of tracking clicks and creating a clickmap using PHP and jQuery. The article explains how to

• Record the X and Y coordinates of the mouse cursor when it is clicked on a web page.
• Save those coordinates to a database
• When called, display a “clickmap” on top of the web page visually displaying the locations of those clicks.

The results are amazing, check it out here. This thing could be used to track clicks in any webpage and use this stuff in marketing or usability studies.