// JavaScript Document

function Client(){
//if not a DOM browser, hopeless
	this.min = false; if (document.getElementById){this.min = true;};

	this.ua = navigator.userAgent;
	this.name = navigator.appName;
	this.ver = navigator.appVersion;  

//Get data about the browser
	this.mac = (this.ver.indexOf('Mac') != -1);
	this.win = (this.ver.indexOf('Windows') != -1);

//Look for Gecko
	this.gecko = (this.ua.indexOf('Gecko') > 1);
	if (this.gecko){
		this.geckoVer = parseInt(this.ua.substring(this.ua.indexOf('Gecko')+6, this.ua.length));
		if (this.geckoVer < 20020000){this.min = false;}
	}
	
//Look for Firebird
	this.firebird = (this.ua.indexOf('Firebird') > 1);
	
//Look for Safari
	this.safari = (this.ua.indexOf('Safari') > 1);
	if (this.safari){
		this.gecko = false;
	}
	
//Look for IE
	this.ie = (this.ua.indexOf('MSIE') > 0);
	if (this.ie){
		this.ieVer = parseFloat(this.ua.substring(this.ua.indexOf('MSIE')+5, this.ua.length));
		if (this.ieVer < 5.5){this.min = false;}
	}
	
//Look for Opera
	this.opera = (this.ua.indexOf('Opera') > 0);
	if (this.opera){
		this.operaVer = parseFloat(this.ua.substring(this.ua.indexOf('Opera')+6, this.ua.length));
		if (this.operaVer < 7.04){this.min = false;}
	}
	if (this.min == false){
		alert('Your browser may not be able to handle this page.');
	}
	
//Special case for the horrible ie5mac
	this.ie5mac = (this.ie&&this.mac&&(this.ieVer<6));
}

var C = new Client();

//for (prop in C){
//	alert(prop + ': ' + C[prop]);
//}



//CODE FOR HANDLING NAV BUTTONS AND FUNCTION BUTTONS

//[strNavBarJS]
function NavBtnOver(Btn){
	if (Btn.className != 'NavButtonDown'){Btn.className = 'NavButtonUp';}
}

function NavBtnOut(Btn){
	Btn.className = 'NavButton';
}

function NavBtnDown(Btn){
	Btn.className = 'NavButtonDown';
}
//[/strNavBarJS]

function FuncBtnOver(Btn){
	if (Btn.className != 'FuncButtonDown'){Btn.className = 'FuncButtonUp';}
}

function FuncBtnOut(Btn){
	Btn.className = 'FuncButton';
}

function FuncBtnDown(Btn){
	Btn.className = 'FuncButtonDown';
}

function FocusAButton(){
	if (document.getElementById('CheckButton1') != null){
		document.getElementById('CheckButton1').focus();
	}
	else{
		if (document.getElementById('CheckButton2') != null){
			document.getElementById('CheckButton2').focus();
		}
		else{
			document.getElementsByTagName('button')[0].focus();
		}
	}
}




//CODE FOR HANDLING DISPLAY OF POPUP FEEDBACK BOX

var topZ = 1000;

function ShowMessage(Feedback){
	var Output = Feedback + '<br /><br />';
	document.getElementById('FeedbackContent').innerHTML = Output;
	var FDiv = document.getElementById('FeedbackDiv');
	topZ++;
	FDiv.style.zIndex = topZ;
	FDiv.style.top = TopSettingWithScrollOffset(30) + 'px';

	FDiv.style.display = 'block';

	ShowElements(false, 'input');
	ShowElements(false, 'select');
	ShowElements(false, 'object');
	ShowElements(true, 'object', 'FeedbackContent');

//Focus the OK button
	setTimeout("document.getElementById('FeedbackOKButton').focus()", 50);
	
//
}

function ShowElements(Show, TagName, ContainerToReverse){
// added third argument to allow objects in the feedback box to appear
//IE bug -- hide all the form elements that will show through the popup
//FF on Mac bug : doesn't redisplay objects whose visibility is set to visible
//unless the object's display property is changed

	//get container object (by Id passed in, or use document otherwise)
	TopNode = document.getElementById(ContainerToReverse);
	var Els;
	if (TopNode != null) {
		Els = TopNode.getElementsByTagName(TagName);
	} else {
		Els = document.getElementsByTagName(TagName);
	}

	for (var i=0; i<Els.length; i++){
		if (TagName == "object") {
			//manipulate object elements in all browsers
			if (Show == true){
				Els[i].style.visibility = 'visible';
				//get Mac FireFox to manipulate display, to force screen redraw
				if (C.mac && C.gecko) {Els[i].style.display = '';}
			}
			else{
				Els[i].style.visibility = 'hidden';
				if (C.mac && C.gecko) {Els[i].style.display = 'none';}
			}
		} 
		else {
			// tagName is either input or select (that is, Form Elements)
			// ie6 has a problem with Form elements, so manipulate those
			if (C.ie) {
				if (C.ieVer < 7) {
					if (Show == true){
						Els[i].style.visibility = 'visible';
					}
					else{
						Els[i].style.visibility = 'hidden';
					}
				}
			}
		}
	}
}



function HideFeedback(){
	document.getElementById('FeedbackDiv').style.display = 'none';
	ShowElements(true, 'input');
	ShowElements(true, 'select');
	ShowElements(true, 'object');
	if (Finished == true){
		Finish();
	}
}


//GENERAL UTILITY FUNCTIONS AND VARIABLES

//PAGE DIMENSION FUNCTIONS
function PageDim(){
//Get the page width and height
	this.W = 600;
	this.H = 400;
	this.W = document.getElementsByTagName('body')[0].clientWidth;
	this.H = document.getElementsByTagName('body')[0].clientHeight;
}

var pg = null;

function GetPageXY(El) {
	var XY = {x: 0, y: 0};
	while(El){
		XY.x += El.offsetLeft;
		XY.y += El.offsetTop;
		El = El.offsetParent;
	}
	return XY;
}

function GetScrollTop(){
	if (typeof(window.pageYOffset) == 'number'){
		return window.pageYOffset;
	}
	else{
		if ((document.body)&&(document.body.scrollTop)){
			return document.body.scrollTop;
		}
		else{
			if ((document.documentElement)&&(document.documentElement.scrollTop)){
				return document.documentElement.scrollTop;
			}
			else{
				return 0;
			}
		}
	}
}

function GetViewportHeight(){
	if (typeof window.innerHeight != 'undefined'){
		return window.innerHeight;
	}
	else{
		if (((typeof document.documentElement != 'undefined')&&(typeof document.documentElement.clientHeight !=
     'undefined'))&&(document.documentElement.clientHeight != 0)){
			return document.documentElement.clientHeight;
		}
		else{
			return document.getElementsByTagName('body')[0].clientHeight;
		}
	}
}

function TopSettingWithScrollOffset(TopPercent){
	var T = Math.floor(GetViewportHeight() * (TopPercent/100));
	return GetScrollTop() + T; 
}

//CODE FOR AVOIDING LOSS OF DATA WHEN BACKSPACE KEY INVOKES history.back()
var InTextBox = false;

function SuppressBackspace(e){ 
	if (InTextBox == true){return;}
	if (C.ie) {
		thisKey = window.event.keyCode;
	}
	else {
		thisKey = e.keyCode;
	}

	var Suppress = false;

	if (thisKey == 8) {
		Suppress = true;
	}

	if (Suppress == true){
		if (C.ie){
			window.event.returnValue = false;	
			window.event.cancelBubble = true;
		}
		else{
			e.preventDefault();
		}
	}
}

if (C.ie){
	document.attachEvent('onkeydown',SuppressBackspace);
	window.attachEvent('onkeydown',SuppressBackspace);
}
else{
	if (window.addEventListener){
		window.addEventListener('keypress',SuppressBackspace,false);
	}
}

function ReduceItems(InArray, ReduceToSize){
	var ItemToDump=0;
	var j=0;
	while (InArray.length > ReduceToSize){
		ItemToDump = Math.floor(InArray.length*Math.random());
		InArray.splice(ItemToDump, 1);
	}
}

function Shuffle(InArray){
	var Num;
	var Temp = new Array();
	var Len = InArray.length;

	var j = Len;

	for (var i=0; i<Len; i++){
		Temp[i] = InArray[i];
	}

	for (i=0; i<Len; i++){
		Num = Math.floor(j  *  Math.random());
		InArray[i] = Temp[Num];

		for (var k=Num; k < (j-1); k++) {
			Temp[k] = Temp[k+1];
		}
		j--;
	}
	return InArray;
}

function WriteToInstructions(Feedback) {
	document.getElementById('InstructionsDiv').innerHTML = Feedback;

}




function EscapeDoubleQuotes(InString){
	return InString.replace(/"/g, '&quot;')
}

function TrimString(InString){
        var x = 0;

        if (InString.length != 0) {
                while ((InString.charAt(InString.length - 1) == '\u0020') || (InString.charAt(InString.length - 1) == '\u000A') || (InString.charAt(InString.length - 1) == '\u000D')){
                        InString = InString.substring(0, InString.length - 1)
                }

                while ((InString.charAt(0) == '\u0020') || (InString.charAt(0) == '\u000A') || (InString.charAt(0) == '\u000D')){
                        InString = InString.substring(1, InString.length)
                }

                while (InString.indexOf('  ') != -1) {
                        x = InString.indexOf('  ')
                        InString = InString.substring(0, x) + InString.substring(x+1, InString.length)
                 }

                return InString;
        }

        else {
                return '';
        }
}

function FindLongest(InArray){
	if (InArray.length < 1){return -1;}

	var Longest = 0;
	for (var i=1; i<InArray.length; i++){
		if (InArray[i].length > InArray[Longest].length){
			Longest = i;
		}
	}
	return Longest;
}

//UNICODE CHARACTER FUNCTIONS
function IsCombiningDiacritic(CharNum){
	var Result = (((CharNum >= 0x0300)&&(CharNum <= 0x370))||((CharNum >= 0x20d0)&&(CharNum <= 0x20ff)));
	Result = Result || (((CharNum >= 0x3099)&&(CharNum <= 0x309a))||((CharNum >= 0xfe20)&&(CharNum <= 0xfe23)));
	return Result;
}

function IsCJK(CharNum){
	return ((CharNum >= 0x3000)&&(CharNum < 0xd800));
}

//SETUP FUNCTIONS
//BROWSER WILL REFILL TEXT BOXES FROM CACHE IF NOT PREVENTED
function ClearTextBoxes(){
	var NList = document.getElementsByTagName('input');
	for (var i=0; i<NList.length; i++){
		if ((NList[i].id.indexOf('Guess') > -1)||(NList[i].id.indexOf('Gap') > -1)){
			NList[i].value = '';
		}
		if (NList[i].id.indexOf('Chk') > -1){
			NList[i].checked = '';
		}
	}
}

//EXTENSION TO ARRAY OBJECT
function Array_IndexOf(Input){
	var Result = -1;
	for (var i=0; i<this.length; i++){
		if (this[i] == Input){
			Result = i;
		}
	}
	return Result;
}
Array.prototype.indexOf = Array_IndexOf;

//IE HAS RENDERING BUG WITH BOTTOM NAVBAR
function RemoveBottomNavBarForIE(){
	if ((C.ie)&&(document.getElementById('Reading') != null)){
		if (document.getElementById('BottomNavBar') != null){
			document.getElementById('TheBody').removeChild(document.getElementById('BottomNavBar'));
		}
	}
}




//HOTPOTNET-RELATED CODE

var HPNStartTime = (new Date()).getTime();
var SubmissionTimeout = 30000;
var Detail = ''; //Global that is used to submit tracking data

function Finish(){
//If there's a form, fill it out and submit it
	if (document.store != null){
		Frm = document.store;
		Frm.starttime.value = HPNStartTime;
		Frm.endtime.value = (new Date()).getTime();
		Frm.mark.value = Score;
		Frm.detail.value = Detail;
		Frm.submit();
	}
}





//JQUIZ CORE JAVASCRIPT CODE

var CurrQNum = 0;
var CorrectIndicator = ':-)';
var IncorrectIndicator = 'X';
var YourScoreIs = 'Your score is ';

//New for 6.2.2.0
var CompletedSoFar = 'Completed so far:';
var ExerciseCompleted = 'You have completed the exercise.';
var ShowCompletedSoFar = false;

var ContinuousScoring = false;
var CorrectFirstTime = 'Questions answered correctly first time: ';
var ShowCorrectFirstTime = false;
var ShuffleQs = false;
var ShuffleAs = false;
var DefaultRight = 'Correct!';
var DefaultWrong = 'Not perfect yet. Please try again.';
var QsToShow = 13;
var Score = 0;
var Finished = false;
var Qs = null;
var QArray = new Array();
var ShowingAllQuestions = false;
var ShowAllQuestionsCaption = 'Show all questions';
var ShowOneByOneCaption = 'Show questions one by one';
var State = new Array();
var Feedback = '';
var TimeOver = false;
var strInstructions = '';
var Locked = false;

//The following variable can be used to add a message explaining that
//the question is finished, so no further marking will take place.
var strQuestionFinished = '';

function CompleteEmptyFeedback(){
	var QNum, ANum;
	for (QNum=0; QNum<I.length; QNum++){
//Only do this if not multi-select
		if (I[QNum][2] != '3'){
  		for (ANum = 0; ANum<I[QNum][3].length; ANum++){
  			if (I[QNum][3][ANum][1].length < 1){
  				if (I[QNum][3][ANum][2] > 0){
  					I[QNum][3][ANum][1] = DefaultRight;
  				}
  				else{
  					I[QNum][3][ANum][1] = DefaultWrong;
  				}
  			}
  		}
		}
	}
}

function SetUpQuestions(){
	var AList = new Array(); 
	var QList = new Array();
	var i, j;
	Qs = document.getElementById('Questions');
	while (Qs.getElementsByTagName('li').length > 0){
		QList.push(Qs.removeChild(Qs.getElementsByTagName('li')[0]));
	}
	var DumpItem = 0;
	if (QsToShow > QList.length){
		QsToShow = QList.length;
	}
	while (QsToShow < QList.length){
		DumpItem = Math.floor(QList.length*Math.random());
		for (j=DumpItem; j<(QList.length-1); j++){
			QList[j] = QList[j+1];
		}
		QList.length = QList.length-1;
	}
	if (ShuffleQs == true){
		QList = Shuffle(QList);
	}
	if (ShuffleAs == true){
		var As;
		for (var i=0; i<QList.length; i++){
			As = QList[i].getElementsByTagName('ol')[0];
			if (As != null){
  			AList.length = 0;
				while (As.getElementsByTagName('li').length > 0){
					AList.push(As.removeChild(As.getElementsByTagName('li')[0]));
				}
				AList = Shuffle(AList);
				for (j=0; j<AList.length; j++){
					As.appendChild(AList[j]);
				}
			}
		}
	}
	
	for (i=0; i<QList.length; i++){
		Qs.appendChild(QList[i]);
		QArray[QArray.length] = QList[i];
	}

//Show the first item
	QArray[0].style.display = '';
	
//Now hide all except the first item
	for (i=1; i<QArray.length; i++){
		QArray[i].style.display = 'none';
	}		
	SetQNumReadout();
	
	SetFocusToTextbox();
}

function SetFocusToTextbox(){
//if there's a textbox, set the focus in it
	if (QArray[CurrQNum].getElementsByTagName('input')[0] != null){
		QArray[CurrQNum].getElementsByTagName('input')[0].focus();
//and show a keypad if there is one
		if (document.getElementById('CharacterKeypad') != null){
			document.getElementById('CharacterKeypad').style.display = 'block';
		}
	}
	else{
  	if (QArray[CurrQNum].getElementsByTagName('textarea')[0] != null){
  		QArray[CurrQNum].getElementsByTagName('textarea')[0].focus();	
//and show a keypad if there is one
			if (document.getElementById('CharacterKeypad') != null){
				document.getElementById('CharacterKeypad').style.display = 'block';
			}
		}
//This added for 6.0.4.11: hide accented character buttons if no textbox
		else{
			if (document.getElementById('CharacterKeypad') != null){
				document.getElementById('CharacterKeypad').style.display = 'none';
			}
		}
	}
}

function ChangeQ(ChangeBy){
//The following line prevents moving to another question until the current
//question is answered correctly. Uncomment it to enable this behaviour. 
//	if (State[CurrQNum][0] == -1){return;}
	if (((CurrQNum + ChangeBy) < 0)||((CurrQNum + ChangeBy) >= QArray.length)){return;}
	QArray[CurrQNum].style.display = 'none';
	CurrQNum += ChangeBy;
	QArray[CurrQNum].style.display = '';
//Undocumented function added 10/12/2004
	ShowSpecialReadingForQuestion();
	SetQNumReadout();
	SetFocusToTextbox();
}

var HiddenReadingShown = false;
function ShowSpecialReadingForQuestion(){
//Undocumented function for showing specific reading text elements which change with each question
//Added on 10/12/2004
	if (document.getElementById('ReadingDiv') != null){
		if (HiddenReadingShown == true){
			document.getElementById('ReadingDiv').innerHTML = '';
		}
		if (QArray[CurrQNum] != null){
//Fix for 6.0.4.25
			var Children = QArray[CurrQNum].getElementsByTagName('div');
			for (var i=0; i<Children.length; i++){
			if (Children[i].className=="HiddenReading"){
					document.getElementById('ReadingDiv').innerHTML = Children[i].innerHTML;
					HiddenReadingShown = true;
//Hide the ShowAllQuestions button to avoid confusion
					if (document.getElementById('ShowMethodButton') != null){
						document.getElementById('ShowMethodButton').style.display = 'none';
					}
				}
			}	
		}
	}
}

function SetQNumReadout(){
	document.getElementById('QNumReadout').innerHTML = (CurrQNum+1) + ' / ' + QArray.length;
	if ((CurrQNum+1) >= QArray.length){
		if (document.getElementById('NextQButton') != null){
			document.getElementById('NextQButton').style.visibility = 'hidden';
		}
	}
	else{
		if (document.getElementById('NextQButton') != null){
			document.getElementById('NextQButton').style.visibility = 'visible';
		}
	}
	if (CurrQNum <= 0){
		if (document.getElementById('PrevQButton') != null){
			document.getElementById('PrevQButton').style.visibility = 'hidden';
		}
	}
	else{
		if (document.getElementById('PrevQButton') != null){
			document.getElementById('PrevQButton').style.visibility = 'visible';
		}
	}
}

var I=new Array();
I[0] = new Array();
I[0][0] = 10;
I[0][1] = '';
I[0][2] = '0';
I[0][3] = new Array();
I[0][3][0] = new Array('Archaic people traveled long distances<br />to find acorns.','Incorrect.  Acorns were abundant where bands lived.',0,0,1);
I[0][3][1] = new Array('Acorns were used to shape stone tools.','Incorrect.  Acorns are too soft to pound or crack stone to form tools.',0,0,1);
I[0][3][2] = new Array('Acorns were part of the Archaic diet.','Correct!  Acorns are the fruit of oak trees.',1,0,1);
I[1] = new Array();
I[1][0] = 10;
I[1][1] = '';
I[1][2] = '0';
I[1][3] = new Array();
I[1][3][0] = new Array('Stretched out rabbit skins were used to make drums for burial ceremonies.','Incorrect.  Archaeologists have not found enough evidence to understand the burial practices of the Archaic people.',0,0,1);
I[1][3][1] = new Array('Rabbit meat was part of the Archaic diet.','Correct.  The Paleoindians hunted megafauna, but there is evidence the Archaic people ate small game like rabbits.',1,0,1);
I[1][3][2] = new Array('Archaic hunters fastened fluted points to the end of spears to hunt rabbits.','Incorrect. The use of fluted points ended with the end of the Paleoindian Period.',0,0,1);
I[2] = new Array();
I[2][0] = 10;
I[2][1] = '';
I[2][2] = '0';
I[2][3] = new Array();
I[2][3][0] = new Array('Netsinkers were used to weigh down fishing nets stretched across a stream.','Correct! This netsinker is made of soapstone which was easy to carve.',1,0,1);
I[2][3][1] = new Array('Netsinkers were used to grind berries to make juice and dye for clothing.','Incorrect.  Archaic people caught fish with the help of netsinkers.',0,0,1);
I[2][3][2] = new Array('Archaic fishermen used netsinkers to anchor their canoes at fishing spots.','Incorrect.  Netsinkers anchored fishing nets, not canoes.  They were small flat stones with notches on opposite edges.',0,0,1);
I[3] = new Array();
I[3][0] = 10;
I[3][1] = '';
I[3][2] = '0';
I[3][3] = new Array();
I[3][3][0] = new Array('Archaic people used hemlock needles to sew their garments.','Incorrect. Hemlock needles were not used as tools.',0,0,1);
I[3][3][1] = new Array('Hemlock trees thrived during the early Archaic period when the climate was colder.','Correct. In addition to hemlock trees, many spruce and pine trees grew in early Archaic forests.',1,0,1);
I[3][3][2] = new Array('Stockades were built with the trunks of hemlock trees to protect the Archaic villages from warfare.','Incorrect. Stockades were not in use until villages emerged in the Woodland Period.',0,0,1);
I[4] = new Array();
I[4][0] = 10;
I[4][1] = '';
I[4][2] = '0';
I[4][3] = new Array();
I[4][3][0] = new Array('Axes were made by grinding and polishing soft stone.','Correct.',1,0,1);
I[4][3][1] = new Array('Archaic people used axes to hunt bear by hurling them from an atlatl.','Incorrect.  Axes, adzes, celts, and gouges were all woodworking tools.',0,0,1);
I[4][3][2] = new Array('The blade of axes was most often made of iron in order to be very sharp.','Incorrect.  Iron was not available as a raw material for tools during the Archaic Period.',0,0,1);
I[5] = new Array();
I[5][0] = 10;
I[5][1] = '';
I[5][2] = '0';
I[5][3] = new Array();
I[5][3][0] = new Array('Chestnut trees were a source of food for the Archaic people.','Correct! Chestnut trees produced edible nuts, which were a basic part of the diet of the Archaic people.',1,0,1);
I[5][3][1] = new Array('Chestnut trees thrived in the Early Archaic Period when the climate was very cold.','Incorrect.  Chestnut trees grew in the later, warmer climate of the Archaic Period.',0,0,1);
I[5][3][2] = new Array('Chestnut leaves were used to create thatched roofs for the houses built in the Archaic Period.','Incorrect. There is little evidence about the roofs of the houses built by the Archaic people.',0,0,1);
I[6] = new Array();
I[6][0] = 10;
I[6][1] = '';
I[6][2] = '0';
I[6][3] = new Array();
I[6][3][0] = new Array('Hearths were built using jasper and flint.','Incorrect.  Chipped stone tools, such as drills and projectile points, were made using jasper and flint.',0,0,1);
I[6][3][1] = new Array('The Archaic people used hearths in  their burial ceremonies to invoke their ancestors.','Incorrect.  There is little evidence about the burial ceremonies of the Archiac people.',0,0,1);
I[6][3][2] = new Array('Hearths of the Archaic Period tell us about the kinds of food that were consumed.','Correct!  Hearths contain the charred remains of seeds and nutshells such as those of hickory and walnuts.',1,0,1);
I[7] = new Array();
I[7][0] = 10;
I[7][1] = '';
I[7][2] = '0';
I[7][3] = new Array();
I[7][3][0] = new Array('Deer were the pet animals of the Archaic people.','Incorrect.  We do not know whether the Archaic people domesticated their animals.',0,0,1);
I[7][3][1] = new Array('The Archaic people hunted deer for their meat.','Correct! Charred deer bones found in hearths indicate that deer were an important source of meat.',1,0,1);
I[7][3][2] = new Array('The Archaic men wore deer antlers as ornaments.','Incorrect.  Deer along with squirrels, bear, birds and rodents were hunted and eaten.',0,0,1);
I[8] = new Array();
I[8][0] = 10;
I[8][1] = '';
I[8][2] = '0';
I[8][3] = new Array();
I[8][3][0] = new Array('Drill and projectile points were made using chert.','Correct!  Chipped stone tools like projectile points were made using hard stones like chert, flint and jasper.',1,0,1);
I[8][3][1] = new Array('Stone bowls made of chert have been discovered at several sites in Pennsylvania.','Incorrect.  Archaeologists have found stone bowls made of a softer stone called \'soapstone\' or \'steatite\' from near the end of the Archaic Period.',0,0,1);
I[8][3][2] = new Array('Chert was chipped to create small beads that adorned the Archaic women.','Incorrect.  Chert was a hard stone used to create hunting and building tools.',0,0,1);
I[9] = new Array();
I[9][0] = 10;
I[9][1] = '';
I[9][2] = '0';
I[9][3] = new Array();
I[9][3][0] = new Array('It is clear from the evidence that Archaic women were in charge of gathering tubers.','Correct! Evidence indicates that Archaic women were most often in charge of gathering plant foods while the men hunted.',1,0,1);
I[9][3][1] = new Array('Remains of tubers can be found in the hearths found on the excavation sites.','Incorrect.  Since tubers are soft and fleshy, no evidence of these plants is preserved in hearths.',0,0,1);
I[9][3][2] = new Array('Tubers were only available in the summer, and the Archaic people moved in search of them every year.','Incorrect.  Tubers were available most of the year and the hunter-gatherers made frequent use of them.',0,0,1);


function StartUp(){
	RemoveBottomNavBarForIE();

//If there's only one question, no need for question navigation controls
	if (QsToShow < 2){
		document.getElementById('QNav').style.display = 'none';
	}
	
//Stash the instructions so they can be redisplayed
	strInstructions = document.getElementById('InstructionsDiv').innerHTML;
	

	

	

	
	CompleteEmptyFeedback();

	SetUpQuestions();
	ClearTextBoxes();
	CreateStatusArray();
	

	
//Check search string for q parameter
	if (document.location.search.length > 0){
		if (ShuffleQs == false){
			var JumpTo = parseInt(document.location.search.substring(1,document.location.search.length))-1;
			if (JumpTo <= QsToShow){
				ChangeQ(JumpTo);
			}
		}
	}
//Undocumented function added 10/12/2004
	ShowSpecialReadingForQuestion();
}

function ShowHideQuestions(){
	FuncBtnOut(document.getElementById('ShowMethodButton'));
	document.getElementById('ShowMethodButton').style.display = 'none';
	if (ShowingAllQuestions == false){
		for (var i=0; i<QArray.length; i++){
				QArray[i].style.display = '';
			}
		document.getElementById('Questions').style.listStyleType = 'decimal';
		document.getElementById('OneByOneReadout').style.display = 'none';
		document.getElementById('ShowMethodButton').innerHTML = ShowOneByOneCaption;
		ShowingAllQuestions = true;
	}
	else{
		for (var i=0; i<QArray.length; i++){
				if (i != CurrQNum){
					QArray[i].style.display = 'none';
				}
			}
		document.getElementById('Questions').style.listStyleType = 'none';
		document.getElementById('OneByOneReadout').style.display = '';
		document.getElementById('ShowMethodButton').innerHTML = ShowAllQuestionsCaption;
		ShowingAllQuestions = false;	
	}
	document.getElementById('ShowMethodButton').style.display = 'inline';
}

function CreateStatusArray(){
	var QNum, ANum;
//For each item in the item array
	for (QNum=0; QNum<I.length; QNum++){
//Check if the question still exists (hasn't been nuked by showing a random selection)
		if (document.getElementById('Q_' + QNum) != null){
			State[QNum] = new Array();
			State[QNum][0] = -1; //Score for this q; -1 shows question not done yet
			State[QNum][1] = new Array(); //answers
			for (ANum = 0; ANum<I[QNum][3].length; ANum++){
				State[QNum][1][ANum] = 0; //answer not chosen yet; when chosen, will store its position in the series of choices
			}
			State[QNum][2] = 0; //tries at this q so far
			State[QNum][3] = 0; //incrementing percent-correct values of selected answers
			State[QNum][4] = 0; //penalties incurred for hints
			State[QNum][5] = ''; //Sequence of answers chosen by number
		}
		else{
			State[QNum] = null;
		}
	}
}



function CheckMCAnswer(QNum, ANum, Btn){
//if question doesn't exist, bail
	if (State[QNum].length < 1){return;}
	
//Get the feedback
	Feedback = I[QNum][3][ANum][1];
	
//Now show feedback and bail if question already complete
	if (State[QNum][0] > -1){
//Add an extra message explaining that the question
// is finished if defined by the user
		if (strQuestionFinished.length > 0){Feedback += '<br />' + strQuestionFinished;}
//Show the feedback
		ShowMessage(Feedback);
//New for 6.2.2.1: If you want to mark an answer as correct even when it's the final choice, uncomment this line.
//		if (I[QNum][3][ANum][2] >= 1){Btn.innerHTML = CorrectIndicator;}else{Btn.innerHTML = IncorrectIndicator;}	
		return;
	}
	
//Hide the button while processing
	Btn.style.display = 'none';

//Increment the number of tries
	State[QNum][2]++;
	
//Add the percent-correct value of this answer
	State[QNum][3] += I[QNum][3][ANum][3];
	
//Store the try number in the answer part of the State array, for tracking purposes
	State[QNum][1][ANum] = State[QNum][2];
	if (State[QNum][5].length > 0){State[QNum][5] += ' | ';}
	State[QNum][5] += String.fromCharCode(65+ANum);
	
//Should this answer be accepted as correct?
	if (I[QNum][3][ANum][2] < 1){
//It's wrong

//Mark the answer
		Btn.innerHTML = IncorrectIndicator;
		
//Remove any previous score unless exercise is finished (6.0.3.8+)
		if (Finished == false){
			WriteToInstructions(strInstructions);
		}	
		
//Check whether this leaves just one MC answer unselected, in which case the Q is terminated
		var RemainingAnswer = FinalAnswer(QNum);
		if (RemainingAnswer > -1){
//Behave as if the last answer had been selected, but give no credit for it
//Increment the number of tries
			State[QNum][2]++;		
		
//Calculate the score for this question
			CalculateMCQuestionScore(QNum);
			
//Get the overall score and add it to the feedback
			CalculateOverallScore();
//New for 6.2.2.1
			var QsDone = CheckQuestionsCompleted();
			if ((ContinuousScoring == true)||(Finished == true)){
				Feedback += '<br />' + YourScoreIs + ' ' + Score + '%.' + '<br />' + QsDone;
				WriteToInstructions(YourScoreIs + ' ' + Score + '%.' + '<br />' + QsDone);
			}
			else{
				WriteToInstructions(QsDone);
			}
		}
	}
	else{
//It's right
//Mark the answer
		Btn.innerHTML = CorrectIndicator;
				
//Calculate the score for this question
		CalculateMCQuestionScore(QNum);
		
//New for 6.2.2.0
		var QsDone = CheckQuestionsCompleted();

//Get the overall score and add it to the feedback
		if (ContinuousScoring == true){
			CalculateOverallScore();
			if ((ContinuousScoring == true)||(Finished == true)){
				Feedback += '<br />' + YourScoreIs + ' ' + Score + '%.' + '<br />' + QsDone;
				WriteToInstructions(YourScoreIs + ' ' + Score + '%.' + '<br />' + QsDone);
			}
		}
		else{
			WriteToInstructions(QsDone);
		}
	}
	
//Show the button again
	Btn.style.display = 'inline';
	
//Finally, show the feedback	
	ShowMessage(Feedback);
	
//Check whether all questions are now done
	CheckFinished();
}

function CalculateMCQuestionScore(QNum){
	var Tries = State[QNum][2] + State[QNum][4]; //include tries and hint penalties
	var PercentCorrect = State[QNum][3];
	var TotAns = GetTotalMCAnswers(QNum);
	var HintPenalties = State[QNum][4];
	
//Make sure it's not already complete

	if (State[QNum][0] < 0){
//Allow for Hybrids
		if (HintPenalties >= 1){
			State[QNum][0] = 0;
		}
		else{
//This line calculates the score for this question
			if (TotAns == 1){
				State[QNum][0] = 1;
			}
			else{
				State[QNum][0] = ((TotAns-((Tries*100)/State[QNum][3]))/(TotAns-1));
			}
		}
//Fix for Safari bug added for version 6.0.3.42 (negative infinity problem)
		if ((State[QNum][0] < 0)||(State[QNum][0] == Number.NEGATIVE_INFINITY)){
			State[QNum][0] = 0;
		}
	}
}

function GetTotalMCAnswers(QNum){
	var Result = 0;
	for (var ANum=0; ANum<I[QNum][3].length; ANum++){
		if (I[QNum][3][ANum][4] == 1){ //This is an MC answer
			Result++;
		}
	}
	return Result;
}

function FinalAnswer(QNum){
	var UnchosenAnswers = 0;
	var FinalAnswer = -1;
	for (var ANum=0; ANum<I[QNum][3].length; ANum++){
		if (I[QNum][3][ANum][4] == 1){ //This is an MC answer
			if (State[QNum][1][ANum] < 1){ //This answer hasn't been chosen yet
				UnchosenAnswers++;
				FinalAnswer = ANum;
			}
		}
	}
	if (UnchosenAnswers == 1){
		return FinalAnswer;
	}
	else{
		return -1;
	}
}





function CalculateOverallScore(){
	var TotalWeighting = 0;
	var TotalScore = 0;
	
	for (var QNum=0; QNum<State.length; QNum++){
		if (State[QNum] != null){
			if (State[QNum][0] > -1){
				TotalWeighting += I[QNum][0];
				TotalScore += (I[QNum][0] * State[QNum][0]);
			}
		}
	}
	if (TotalWeighting > 0){
		Score = Math.floor((TotalScore/TotalWeighting)*100);
	}
	else{
//if TotalWeighting is 0, no questions so far have any value, so 
//no penalty should be shown.
		Score = 100; 
	}
}

//New for 6.2.2.0
function CheckQuestionsCompleted(){
	if (ShowCompletedSoFar == false){return '';}
	var QsCompleted = 0;
	for (var QNum=0; QNum<State.length; QNum++){
		if (State[QNum] != null){
			if (State[QNum][0] >= 0){
				QsCompleted++;
			}
		}
	}
//Fixes for 6.2.2.2
	if (QsCompleted >= QArray.length){
		return ExerciseCompleted;
	}
	else{
		return CompletedSoFar + ' ' + QsCompleted + '/' + QArray.length + '.';
	}
}

function CheckFinished(){
	var FB = '';
	var AllDone = true;
	for (var QNum=0; QNum<State.length; QNum++){
		if (State[QNum] != null){
			if (State[QNum][0] < 0){
				AllDone = false;
			}
		}
	}
	if (AllDone == true){
	
//Report final score and submit if necessary
		CalculateOverallScore();
		FB = YourScoreIs + ' ' + Score + '%.';
		if (ShowCorrectFirstTime == true){
			var CFT = 0;
			for (QNum=0; QNum<State.length; QNum++){
				if (State[QNum] != null){
					if (State[QNum][0] >= 1){
						CFT++;
					}
				}
			}
			FB += '<br />' + CorrectFirstTime + ' ' + CFT + '/' + QsToShow;
		}
		
//New for 6.2.2.0
		FB += '<br />' + ExerciseCompleted;
		
		WriteToInstructions(FB);
		
		Finished == true;




		TimeOver = true;
		Locked = true;
		


		Finished = true;
		Detail = '<?xml version="1.0"?><hpnetresult><fields>';
		for (QNum=0; QNum<State.length; QNum++){
			if (State[QNum] != null){
				if (State[QNum][5].length > 0){
					Detail += '<field><fieldname>Question #' + (QNum+1) + '</fieldname><fieldtype>question-tracking</fieldtype><fieldlabel>Q ' + (QNum+1) + '</fieldlabel><fieldlabelid>QuestionTrackingField</fieldlabelid><fielddata>' + State[QNum][5] + '</fielddata></field>';
				}
			}
		}
		Detail += '</fields></hpnetresult>';
		setTimeout('Finish()', SubmissionTimeout);
	}

}