jQuery quiz, show result as HTML output

I am working on a quiz using jQuery.
The result is shown as alert window.

But it is not working sometimes.

I want to add the following functionality:

Show final result as HTML output.
Submit answer on radio button check and not on NEXT button.
If checked answer is correct,make it GREEN font or if it is wrong make it RED font.

The link for fiddle is http://jsfiddle.net/3kpFV/80/

Please reply. Thanks.