Quiz Apllication Question

1

Hey everyone
I have a quiz application that when the user clicks on the answer it marks it either correct or wrong and proceeds immediatley to the next question.
I want the user to be able to cycle back and forth through the questions before submitting there answers just like a paper test. The user should be able to go back and check thier work before submitting…how would I go about that


function QuizItem(question)
{
 this.question=question;
 this.answers=new Array();
 this.numOfAnswers=0;
 this.correctAnswer=0;
 this.image='';
 this.getQuestion=function()
 {
  
    
  return this.question;
 }
 this.addAnswer=function(answer, isCorrectAnswer)
 {
  this.answers[this.numOfAnswers]=answer;
  if (isCorrectAnswer)
   this.correctAnswer=this.numOfAnswers;
  this.numOfAnswers++;
 }
 this.getAnswer=function(answerNumberToGet)
 {
  return this.answers[answerNumberToGet];
 }
 
 this.getCorrectAnswerNumber=function()
 {
  return this.correctAnswer;
 }
 
 this.checkAnswerNumber=function(userAnswerNumber)
 {
  if (userAnswerNumber==this.getCorrectAnswerNumber())
   gotoAndPlay("Correct");
  else
  {
   wrongQuestion=this.question
   gotoAndPlay("Wrong");
   }
   
 }
 this.getNumOfAnswers=function()
 {
  return this.answers.length; 
 }
}