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Look at the source code. ~7000 lines of javascript -> anywhere from a month to a year, depending on how good/fast you are.

That's very very nice. The ability to effortlessly tinker with code samples is priceless. As is use of JQuery.

I used this tutorial when I was learning about the Canvas a few months ago - thanks very much for making it, it's a fantastic resource!

If you're interested in HTML canvas, and want to get started quickly, you should look into processing.js: http://processingjs.org/

I tried processing.js (having used both processing and canvas+js) and I must say I would _not yet_ recommend it.

The tools just aren't there yet, I'd rather develop in plain js+canvas for now (for which you can get decent editors, debuggers, profilers, etc.)