`event._stoppedWithFalse`?

Don't put actions in conditionals. Have the `notifier.fire(event)` in the block, not the condition.

I find inlined `} else if (...) {` easier to read than `} else { if (...) { ... } }`. I don't know if there's a style guide point on this, but the rest of the YUI code, so far as I'm aware, inlines `else if`.