Basic threading in JavaScript; multiple threads of execution in JavaScript

I was searching the web yesterday for this and didn’t really find a simple way of doing this and suddenly, I remembered something.

It’s extremely simple, someone could build on it with all sorts of features but for now, here is an example:
http://images.code-head.com/code/javascript/js-threads.html

As you can see there are two counters, one is counting up and the other down simultaneously.

Here is the start_thread function:

             function thread_start(callback) {
		setTimeout(callback, 1);
		return true;
	}

The trick is that setTimeout *does not* block the execution

I hope this helps someone