HTML - Efficient Use Of Thumbnails In A Photo Show Web Page?

var ans = new Array;
var done = new Array;
var yourAns = new Array;
var explainAnswer = new Array;

var score = 0;
ans[1] = "b";
ans[2] = "b";
ans[3] = "a";
ans[4] = "c";
ans[5] = "b";



explainAnswer[1]="Roar is Blackburn's mascot";
explainAnswer[2]="John Coleman is Accrington's manager";
explainAnswer[3]="The picture was infact David Beckham";
explainAnswer[4]="The golden oldie Ryan Giggs was PFA Player of the year";
explainAnswer[5]="The reason why Answer 5 is Blah Blah Blah";

function Engine(question, answer) {
yourAns[question]=answer;
}

function Score(){
var answerText = "How did you do?\n------------------------------------\n";
for(i=1;i<=5;i++){
   answerText=answerText+"\nQuestion :"+i+"\n";
  if(ans[i]!=yourAns[i]){
    answerText=answerText+"\nThe correct answer was " +ans[i] + "\n"+explainAnswer[i]+"\n";
  }
  else{
    answerText=answerText+" \nCorrect! \n";
    score++;
  }
}

answerText=answerText+"\n\nYour total score is : "+score+"\n";

//now score the user
answerText=answerText+"\nComment : ";
if(score<=0){
answerText=answerText+"You need to learn some more";
}
if(score>=1 && score <=1){
answerText=answerText+"Bit more practice needed";
}
if(score>=2 && score <=2){
answerText=answerText+"Bit more practice needed";
}
if(score>=3 && score <=3){
answerText=answerText+"Neither bad or birlliant. Good effort";
}
if(score>=4 && score <=4){
answerText=answerText+"4/5 aint bad!";
}
if(score>4){
answerText=answerText+"You are a footballing expert!!";
}

alert(answerText);

}