Simple jquery quiz based on checkboxes

Simple jquery quiz based on checkboxes

      Hi,
I've got a problem with creating a simple quiz, based on checkboxes, where multiple answers are correct.
Here is an example (first three answers are correct)
http://jsfiddle.net/DUNK9/1/

Is it possible to do this with jquery in a simple way?
If so, can you suggest me some methods or what should I check in documentation?
I found some examples but all of them all based on radio buttons and only one correct answer.

Sorry for this question, but I'm new to jquery library and javascript, I read javascript & jquery the missing manual but still have no idea is this possible.

Thanks and take care guys!