A Math Toy, sort of

I was thinking about nifty visual things you could do with just HTML and JavaScript, inspired in part by the 5k contest. This was the result. If you're familiar with the Golden Rectangle, you'll see why it's called a "Math Toy."

Alas, because Netscape and IE have different ways of trapping events, you have to choose the one that fits your browser. Enjoy!

IE 4+/Netscape 6+ Version

Netscape 4 Version

Hint: Make sure you click and double click when you're trying it out.