Fixed invalid event name and usage.

Thanks to Apu for reporting this.

Missing include was breaking unit tests if they were run separately.

Missing breaks in one switch.

This makes the UI more consistent as you work through the quiz. The improvement is more noticable in some themes than others.

Note that according to http://www.quirksmode.org/css/contents.html, the > CSS selector works in IE 7+, so is probably now safe to use.