The movies are named to include their geometry. (There’s no practical way to get the dimensions from a QuickTime movie
without this hack.) So the first filename on this page is
first_steps_sm-iPhone_320x240.m4v. As long as the dimensions are matched by [any number up
to 4 digits][the letter x][any number up to 4 digits] the geometry can be read by the function in this page.
The links to the movies have the classname “popup”, and the script looks for those. Further, the links are directly to the movie files, and the script assigns those links into the QuickTime object tag.
Links with the popup class are assigned a listener function, which traps their clicks and assigns their href to be the location of an object/embed/ActiveX QuickTime tag, and then shows, resizes, and centers that tag in a DIV. When you click the close box, it hides again.
The movies are in an iPod-friendly format, which means they will also play in a QuickTime plug-in in a browser without further ado, too. (iDevices can play a subset of the formats and encodings that the QuickTime plugin can play.)