(More) decent looking examples. Many bug fixes. Still no documentation.

Obvious outstanding issues:
- MathJax typesetting changes the size of DIVs, so the width of the DIV labels in the legend are... not so easy to find at chart construction. So the onClick (to fade-in/out) handlers will seem to behave predictably strangely.
- Strangely it works perfectly on Windows (Chrome) but there is some strange behaviour on my Mac (Chrome).