var useranswers = new Array();
var answered = 0;

function renderQuiz()
{
	for(i=0;i<questions.length;i++)
	{
		document.writeln('<div class="quiz-q"><p class="question">' + questions[i] + ' <span id="result_' + i + '"><img src="../g/blank.gif" alt="" /></span></p></div>');
		for(j=0;j<choices[i].length;j++)
		{
			document.writeln('<div class="quiz-a"><input type="radio" name="answer_' + i + '" value="' + choices[i][j] + '" id="answer_' + i + '_' + j + '" class="question_' + i + '" onclick="submitAnswer(' + i + ', this, \'question_' + i + '\', \'label_' + i + '_' + j + '\')" /><label id="label_' + i + '_' + j + '" for="answer_' + i + '_' + j + '"> ' + choices[i][j] + '</label></div>');
		}
	}
	document.writeln('<p><input type="submit" class="quizsubmit" value="Show Score" onclick="showScore()" /> <input type="submit" value="Reset Quiz" class="quizreset" onclick="resetQuiz(true)" /></p><p style="display:none"><img src="correct.gif" alt="Correct!" /><img src="incorrect.gif" alt="Incorrect!" /></p>');
}
function resetQuiz(showConfirm)
{
	if(showConfirm)
		if(!confirm("Are you sure you want to reset your answers and start from the beginning?"))
			return false;
			
	document.location = document.location;
}
function submitAnswer(questionId, obj, classId, labelId)
{
	useranswers[questionId] = obj.value;
	document.getElementById(labelId).style.fontWeight = "bold";
	disableQuestion(classId);
	showResult(questionId);
	answered++;
}
function showResult(questionId)
{
	if(answers[questionId] == useranswers[questionId])
	{
		document.getElementById('result_' + questionId).innerHTML = '<img src="../g/correct.gif" alt="Correct!" />';
	}
	else
	{
		document.getElementById('result_' + questionId).innerHTML = '<img src="../g/incorrect.gif" alt="Incorrect!" />';
	}
}
function showScore()
{
	if(answered != answers.length)
	{
		alert("You have not answered all of the questions yet!");
		return false;
	}
	questionCount = answers.length;
	correct = 0;
	incorrect = 0;
	for(i=0;i<questionCount;i++)
	{
		if(useranswers[i] == answers[i])
			correct++;
		else
			incorrect++;
	}
	pc = Math.round((correct / questionCount) * 100);
	alertMsg = "You scored " + correct + " out of " + questionCount + "\n\n";
	alertMsg += "You correctly answered " + pc + "% of the questions! \n\n";
	if(pc == 100)
		alertMsg += response[0];
	else if(pc >= 90)
		alertMsg += response[1];
	else if(pc >= 70)
		alertMsg += response[2];
	else if(pc > 50)
		alertMsg += response[3];
	else if(pc >= 40)
		alertMsg += response[4];
	else if(pc >= 20)
		alertMsg += response[5];
	else if(pc >= 10)
		alertMsg += response[6];
	else
		alertMsg += response[7];
		
	if(pc < 100)
	{
		if(confirm(alertMsg))
			resetQuiz(false);
		else
			return false;
	}
	else
	{
		alert(alertMsg);
	}
}
function disableQuestion(classId)
{
	var alltags=document.all? document.all : document.getElementsByTagName("*")
	for (i=0; i<alltags.length; i++)
	{
		if (alltags[i].className == classId)
		{
			alltags[i].disabled = true;
		}
	}
}