Quake 2d game in javascript

Ok, so I have been doing investigating on doing 3d games using the 2d canvas in javascript. I finally found a site that does a pretty impressive thing with it, they made a quake map and put it online. here it is

http://www.zynaps.com/site/experiments/quake.html

There is even a skeelton in one corner.

My computer and connection are too slow for that page ;)