My solution to the Quiz Challenge Pt. 2 (Feedback appreciated)

var correctAnswers = [];
var incorrectAnswers = [];
var questions = [
                  ['Which is the biggest planet on our galaxy?', 'jupiter'],
                  ['Which is the second planet from the sun?', 'venus'],
                  ['To which planet we refer to as the "Red Planet"?', 'mars']
                ];

//The id paramenter was added in case we need to use this function in other elements of the page.
function print(id,message) {
  var outputDiv = document.getElementById(id);
  outputDiv.innerHTML = message;
}

for ( var i = 0; i < questions.length; i+= 1 ){
    var userInput = prompt(questions[i][0]);
        userInput = userInput.toLowerCase();
        if (userInput === questions[i][1]){
              alert("Correct!");
              correctAnswers.push(questions[i][0]);
        }else{
              alert("Incorrect!");
              incorrectAnswers.push(questions[i][0]);
        }
}

var html = "<h1>Results</h1>";
    html+= "<i>You answered "+correctAnswers.length+" out of "+questions.length+" questions correctly!</i>";
    html+= "<h2>Correct Answers</h2>";
    if (correctAnswers.length > 0){
        html+= "<ol><li>";
        html+= correctAnswers.join("</li><li>");
        html+= "</li></ol>";
    }else{
        html+= "<i>You did not answered correctly any of the questions.</i>"; 
    }
    if (incorrectAnswers.length > 0){
        html+= "<h2>Incorrect Answers</h2>";
        html+= "<ol><li>";
        html+= incorrectAnswers.join("</li><li>");
        html+= "</li></ol>";
    }
//Print the html to the element containing the 'output' id.
print('output',html);