I don't like this style, mostly because they don't "stack".<p>Here's an example:<p>* User clicks on the good button, notification pops up.
* User clicks on the bad button. Notification still there.
* User clicks clicks clicks. Alert finally shows, but 5 times in a row.
This looks cool. I'm a fan of notifications in general and I like thinking of how notifications can be improved and such. I will say that this is a departure from notifications I usually see on the web with the sliding block that has an 'x'.<p>Comparing it to humanmsg, the messages themselves are similar although it would be better if it had (not sure if it does and was disabled) the message log.
Please don't take it personally, but I would never use that and neither should anyone else. First of all, building a 'notification system' is incredibly easy, it's just javascript popups. Reading through your code and adapting it to my own application would be a waste of time. Pick any decent js framework and you can do this within fractions of an hour.
Secondly - don't do popup notifications ever. They are the antithesis of user intent. Nobody ever 'wants' to see a popup.