yes it is cool, I've spent hours w/ it in the past!
there's another tire site that uses it too, unfortunately what makes it work is java, and I don't have a clue how to code that, but if you do [or know someone] the files that run it are
"http://www.autowaretech7.net/nextwheels/nextwheels_online.class"
"http://www.autowaretech7.net/nextwheels/nextwheels_online.jar"
and those addresses should download'em for ya
Bill