// Quiz Javascript
// copyright 29th October 2006, by Stephen Chapman
// permission to use this Javascript on your web page is granted
// provided that all of the code in this script (including these
// comments) is used without any alteration

var quizArray = [
'43~47~How many parts are needed to manufacture the Boeing 787 Dreamliner?~more than 4,000~more than 40,000~more than 400,000~more than 4,000,000',
'73~47~How many parts are needed to manufacture the A380 airbus?~more than 4,000~more than 40,000~more than 400,000~more than 4,000,000',
'26~42~About how many 747 airplanes are produced each month in the Boeing Manufacturing Plant?~6~7~9~10',
'50~75~How much does a 747 airplane cost?~2.3 to 3 mil~23 to 30 mil~230 to 300 mil~300 to 500 mil',
'29~51~How much does the new Boeing 787 Dreamliner cost?~300 to 500 mil~150 to 200 mil~90 to 150 mil~50 to 90 mil',
'25~80~The Airbus A380 is the largest commercial airplane ever manufactured in the world.~True~False',
'44~57~How many companies are involved in manufacturing the A380 airbus parts of A380 airbus ?~more than 6000~more than 3000~more than 1500',
'15~81~In the airplane assembly process, the fuselage is always the first to be assembled.~True~False',
'117~37~In the airplane assembly process, the painting is always carried out last.~True~False',
'25~49~In the airplane assembly process, the tail is always assembled before the wings.~True~False'
];
 
var qpp = 1; // questions per page to display


var perPage = 0; var n1 = 109; var n2 = 13;
var qsParm = []; 

function qs() 
{
	var query = window.location.search.substring(1); 
	var parms = query.split('&'); 
	for (var i=0; i<parms.length; i++) 
	{
		var pos = parms[i].indexOf('='); 
		if (pos > 0) {
			var key = parms[i].substring(0,pos); 
			var val = parms[i].substring(pos+1); 
			qsParm[key] = val;
		}
	}
} 

qsParm['qnum'] = 0; 
qsParm['cor'] = 0; 
qsParm['fin'] = 0; 
qs(); 
var qnum = qsParm['qnum']; 
var cor = qsParm['cor'];cor=cor%n1;
var pageLoaded = 0; 

window.onload = function() {pageLoaded = 1;}; 

function loaded(i,f) {
	if (document.getElementById && document.getElementById(i) != null) f(); 
	else if (!pageLoaded) 
		setTimeout('loaded(\''+i+'\','+f+')',100);
} 

loaded('quiz'+qpp,loadQuiz);

function loadQuiz() 
{
	if (qnum>=quizArray.length) displayResult(); 
	else {
		displayQuiz(ent = document.getElementById('quiz1'),qnum++); 
		if (qpp > 1 && (ent = document.getElementById('quiz2')) && qnum<quizArray.length)  	
			displayQuiz(ent,qnum++); 
		var newB = document.createElement("button"); 
		newB.style.styleFloat = 'right'; 
		newB.style.cssFloat = 'right';
		newB.onclick = function() {nextPage(qnum);return false;}; 
		var newTb = document.createTextNode('Next >>'); 
		newB.appendChild(newTb); ent.appendChild(newB);
	}
}

function displayQuiz(ent,qnum) {
	perPage++; 
	var qna = quizArray[qnum].split('~'); 
	var newF = document.createElement("form"); 
	var newDq = document.createElement("div"); 
	newDq.className = 'question'; 
	newDq.appendChild(document.createTextNode(Number(qnum+1)+ ': ' +qna[2])); newF.appendChild(newDq); 
	newDq = document.createElement("div"); 
	newDq.className = 'answers'; 
	
	for (var i = 3; qna[i] != null && qna[i] != ''; i++) {
		var newDa = document.createElement("label"); 
		newDa.htmlFor = 'a'+qnum+i; /*@cc_on @if (@_jscript) var newR = document.createElement("<input name='a"+qnum+"'>"); @else */ 
		
		var newR = document.createElement("input"); 
		newR.name = 'a'+qnum; /* @end @*/ 
		newR.type = 'radio'; newR.id = 'a'+qnum+i; 
		newR.value = i; 
		newDa.appendChild(newR); 
		newDa.appendChild(document.createTextNode(' '+qna[i]+' ')); newDq.appendChild(newDa);
	} 
	newF.appendChild(newDq); document.getElementById('quiz'+perPage).appendChild(newF);
}

function displayResult() {
	var newP = document.createElement("p");newP.style.textAlign = 'center'; 
	var newB = document.createElement("b"); newB.appendChild(document.createTextNode('Congratulations.')); newB.appendChild(document.createElement("br")); 
	newB.appendChild(document.createTextNode(' You have completed the quiz.')); newP.appendChild(newB); 
	newP.appendChild(document.createElement("br")); 
	newP.appendChild(document.createElement("br")); 
	newP.appendChild(document.createTextNode('You answered ' + cor + ' of the ' + qnum + ' questions correctly.')); 
	newP.appendChild(document.createElement("br")); 
	newP.appendChild(document.createTextNode('You have earn ' + cor + ' airplane stars!')); 

	document.getElementById('quiz1').appendChild(newP); 
	var newC = document.createElement("button"); 
	newC.style.styleFloat = 'right'; 
	newC.onclick = function() {cor = 0; nextPage(0);return false;}; newC.appendChild(document.createTextNode('Try Again')); document.getElementById('quiz1').appendChild(newC);
}

function checkAnswer(e,b,g,q){
	var a = -1; var x = (b%n2) + 2; 
	for (var i=3; document.getElementById(e+i); i++) {
		if (document.getElementById(e+i).checked) {a = i-3;}
	} 
	var c = (g%x); return a == c?1:0;
}

function nextPage(qnum) {
	for (var i=qnum-perPage; i < qnum; i++) {
		var qna = quizArray[i].split('~'); 
		cor += checkAnswer('a'+i,qna[1],qna[0],i);
	} var thispage = self.location.href; 
	var www = thispage.lastIndexOf('?'); 
	if (www != -1) thispage = thispage.substr(0,www); 
	var p = Math.floor((Math.random() * 8) + 2); 
	var m = (p * n1) +cor; 
	var nxt = thispage + '?qnum='+ qnum +'&cor='+m; 
	if (qnum >= quizArray.length) 
		nxt += '&fin=1'; 
	top.location.href = nxt;
}