If you download the zip file attached to the June 16 post (you'll need to login as a member), it includes an example, view the source of example.html and you'll see in addition to the mootools script line in <head>, you'll also need to add a few other lines of code - within <head> look for the lines of code beginning window.addEvent - and in <body> look for the additional <div id="mousemove" class="inside move">