Quiz in jQuery
— Add client-side data validation: make sure the user answers each question before proceeding to the next question.
— Add a “Back” button to allow the user to go back and change her answer. The user can go back up to the first question. For the questions that the user has answered already, be sure to show the radio button selected, so that the user is not forced to answer the questions again, which she has completed.
— Use jQuery to add animation (fade out the current question and fade in the next question).