jQuery SVG, why can't I addClass?

Question

I am using jQuery SVG. I can\'t add or remove a class to an object. Anyone know my mistake?

The SVG:

Answer 1

After loading jquery.svg.js you must load this file: http://keith-wood.name/js/jquery.svgdom.js.

Source: http://keith-wood.name/svg.html#dom

Working example: http://jsfiddle.net/74RbC/99/