// pn - Positive AND negative
// dp - decimal places
// Jamie - May 8, 02
function getNumericPattern (pn, dp) {
	var neg = (pn) ? '-?' : '';
	var p = '(^' + neg + '\\d\\d*$)';
	if (dp > 0) {
		p += '|(^' + neg + '\\d\\d*\\.\\d{0,' + dp + '}$)|(^' + neg + '\\.\\d{1,' + dp + '}$)';
	}
	return new RegExp (p);
}

function daylightSavings (date)
{
	today = new Date ();

	if (today.getTimezoneOffset () == date.getTimezoneOffset ())
	{
		return true;
	}
	else
	{
		return false;
	}
}

// date function --------------------------------------------
// x is date adjust, use 0 for today's date
// t is type, t == 1 prints 1/1/01, t == 2 prints 01.01.01, t == 3 prints January 1, 2001
// t == 4 prints Monday, January 1  t == 5 prints Monday, January 1, 2001
function getaDate(x,t) {
	Todays = new Date();
	var d = Todays.getDate();
	var m = Todays.getMonth();
	var y = Todays.getYear();
	var da = Todays.getDay();
	m = m + 1;
	d = d + x;
	while (d > days(m,y)) {
		d = d - days(m,y);
		m++;
		if (m > 12) {
			m = 1;
			y++;
		}
	}
	while (d < 1) {
		d = d + 30;
		m--;
		if (m < 1) {
			m = 12;
			y--;
		}
	}
	if(navigator.appName == "Netscape")
	{y = y + 1900;}
	y = y - 2000;
	if (y < 10)
	{ y = "0"+y; }
	if (t == 1) {
		TheDate = m + "/" + d + "/" + y
	}
	if (t == 2) {
		if (d < 10)
			d = "0"+d
		if (m < 10)
			m = "0"+m
		TheDate = m + "." + d + "." + y
	}
	if (t == 3) {
		y = 20 + y;
		m = mon(m);
		TheDate = m + " " + d + ", " + y
	}
	if (t == 4) {
		m = mon(m);
		da = whatDay(da,x);
		TheDate = da + ", " + m + " " + d
	}
	if (t == 5) {
		m = mon(m);
		y = 20 + y;
		da = whatDay(da,x);
		TheDate = da + ", " + m + " " + d + ", " + y
	}
	document.write(TheDate);
}

// generates correct day for pretty printing the day
function weekDay (d) {
	var dayText = "";
	if (d == 0)
		dayText += "Sunday";
	if (d == 1)
		dayText += "Monday";
	if (d == 2)
		dayText += "Tuesday";
	if (d == 3)
		dayText += "Wednesday";
	if (d == 4)
		dayText += "Thursday";
	if (d == 5)
		dayText += "Friday";
	if (d == 6)
		dayText += "Saturday";
	return dayText;
}

// generates correct month for pretty printing the date
function mon(m) {
	var dateText = "";
	if (m == 1)
	    dateText += "January"
	if (m == 2)
	    dateText += "February"
	if (m == 3)
	    dateText += "March"
	if (m == 4)
	    dateText += "April"
	if (m == 5)
	    dateText += "May"
	if (m == 6)
	    dateText += "June"
	if (m == 7)
	    dateText += "July"
	if (m == 8)
	    dateText += "August"
	if (m == 9)
	    dateText += "September"
	if (m == 10)
	    dateText += "October"
	if (m == 11)
	    dateText += "November"
	if (m == 12)
	    dateText += "December"
	return dateText
}

function days(m,y) {
	var daysInMonth = "";
	if (m == 2 && amILeap(y))
		daysInMonth = 29
	if (m == 2 && !amILeap(y))
		daysInMonth = 28
	if (m == 4 || m == 6 || m == 9 || m == 11)
		daysInMonth = 30
	if (m == 1 || m == 3 || m == 5 || m == 7 || m == 8 || m == 10 || m == 12)
		daysInMonth = 31
	return daysInMonth
}

function setDays(d, dLen, showBlank)
{
    var curLen = d.options.length;
    while (d.options.length < dLen)
    {
        var value = showBlank ? d.options.length : d.options.length + 1;
        d.options[d.options.length] = new Option (value, value, false, false);
    }

    while (d.options.length > dLen)
    {
        if (d.options[d.options.length-1].selected)
        {
            d.options[d.options.length-2].selected = true;
        }
        d.options[d.options.length-1] = null;
    }
}

function amILeap(x) {
	while (x > 3) {
		x -= 4;
	}
	if (x == 0) {
		return true
	}
	else
		return false
}

function whatDay(d,x){
	var dayText = "";
	d = d + x;
	while (d > 6) {
		d -= 7;
	}
	while (d < 0) {
		d += 7;
	}
	if (d == 0)
		dayText += "Sunday"
	if (d == 1)
	    dayText += "Monday"
	if (d == 2)
		dayText += "Tuesday"
	if (d == 3)
		dayText += "Wednesday"
	if (d == 4)
		dayText += "Thursday"
	if (d == 5)
		dayText += "Friday"
	if (d == 6)
		dayText += "Saturday"
	return dayText
}

// end date code ----------------------------------

// gives correct CSS if Mac or non-Mac ----------------------------
function text(){
	//if (navigator.appVersion.indexOf("Mac") != -1 && (navigator.appName.indexOf("Netscape") != -1 ||  parseInt(navigator.appVersion) < 5)) {
/* if (navigator.appVersion.indexOf("Mac") != -1 && (((navigator.appName.indexOf("Netscape") != -1 && parseInt(navigator.appVersion) != 5) || navigator.appVersion.indexOf("5.0") != -1)) || navigator.appName.indexOf("Netscape/7") != -1) { */
/*		if (navigator.appVersion.indexOf("Mac") != -1 && navigator.appName.indexOf("Netscape6") == -1){ */
	if (navigator.appVersion.indexOf("Mac") != -1 && (((navigator.appName.indexOf("Netscape") != -1 && parseInt(navigator.appVersion) != 5) || navigator.appVersion.indexOf("5.0") == -1))) {
		document.write("<link rel=stylesheet href=\"/css/aplia_macnn.css\" type=\"text/css\">"); }
	else {
		document.write("<link rel=stylesheet href=\"/css/aplia.css\" type=\"text/css\">");
	}
}

// return version number (e.g., 4.03)
function versionNumber() {
	return parseFloat(navigator.appName)
}

function whatTextAmI(){
	if (navigator.appVersion.indexOf("Mac") != -1 && (((navigator.appName.indexOf("Netscape") != -1 && parseInt(navigator.appVersion) != 5) || navigator.appVersion.indexOf("5.0") == -1))) {
		document.write("/css/aplia_macnn.css"); }
	else {
		document.write("/css/aplia.css");
	}
}

// prints version
function whatAmI(){
	document.write("appVersion: " + navigator.appVersion);
	document.write("<br><br>");
	document.write("appName: " + navigator.appName);
	document.write("<br><br>");
	document.write("other app version: " + parseInt(navigator.appVersion));
}

// makes "student answer" pretty
function prettyMe(x) {
	if (x == 1) {
	   document.write("A");
	}
	else if (x == 2) {
	   document.write("B");
	}
	else if (x == 3) {
	   document.write("C");
	}
	else if (x == 4) {
	   document.write("D");
	}
	else if (x == 5) {
	   document.write("E");
	}
	else {
	   document.write("Not Answered");
	}
}

// pop up function - full browser functionality, forces non-full screen
//  function printablePage(content) {
// window.open("content","Information","toolbar=1,location=1,directories=1,status=1,menubar=1,scrollbars=1,resizable=1,width=400,height=300");
//  }

// prints out 3 select boxes with today's date --------------------------------
function dateMeToday() {
	document.write("<select name=\"start_month\" size=\"1\" class=\"txtsub\">");
	Todays = new Date();
	var mo = Todays.getMonth();
	mo++;
	//var i = 0;
	for (var i=1; i < 13; i++) {
		if (i == mo) {
			document.write("<option value=\"" + i + "\" selected>" + mon(i) + "</option>");
		} else {
			document.write("<option value=\"" + i + "\">" + mon(i) + "</option>");
		}
	}
	document.write("</select>&nbsp;<select name=\"start_day\" size=\"1\" class=\"txtsub\">");
	var da = Todays.getDate();
	for (var j=1; j < 32; j++) {
		if (j == da) {
			document.write("<option value=\"" + j + "\" selected>" + j + "</option>");
		} else {
			document.write("<option value=\"" + j + "\">" + j + "</option>");
		}
	}
	document.write("</select>&nbsp;<select name=\"start_year\" size=\"1\" class=\"txtsub\">");
	var ye = Todays.getYear();
	for (var k=2001; k < 2005; k++) {
		if (k == ye) {
			document.write("<option value=\"" + k + "\" selected>" + k + "</option>");
		} else {
			document.write("<option value=\"" + k + "\">" + k + "</option>");
		}
	}
	document.write("</select>");
}

// simple confirm scripts ----------------------------------
function del_assign(x)
{
	var change_me = confirm("Delete this assignment?");
	if (change_me == true)
	{
		/* this is where the assignment should be deleted */
	}
}

function del_announce(x)
{
var change_me = confirm("Delete this announcement?");
	if (change_me == true)
	{
		/* this is where the announcement should be deleted */
	}
}

function active_block(x)
{
	var change_me = confirm("Change this student's status?");
	if (change_me == true)
	{
  /* this is where the students status should be switched, visually resulting in
     1) button changing (make active to block student, or vice versa)
	 2) status changing (active to Blocked with date or vice versa)
	 and in the database changing the status */
	}
}

//-- Converts date passed in mm/dd/yyyy format to Date object.
function newDate (dateStr)
{
	var firstSlash = dateStr.indexOf ("/");
	var lastSlash = dateStr.lastIndexOf ("/");
	var month = dateStr.substr (0, firstSlash) - 1;
	var day = dateStr.substring (firstSlash + 1, lastSlash);
	var year = dateStr.substr (lastSlash + 1);
	var newDate = new Date (year, month, day);
	return newDate;
}

function getShortMonthStr (date)
{
	var monthStr = "UNKNOWN_MONTH";
	switch (date.getMonth ()) {
		case (0):
			monthStr = "Jan. ";
			break;
		case (1):
			monthStr = "Feb. ";
			break;
		case (2):
			monthStr = "Mar. ";
			break;
		case (3):
			monthStr = "Apr. ";
			break;
		case (4):
			monthStr = "May ";
			break;
		case (5):
			monthStr = "Jun. ";
			break;
		case (6):
			monthStr = "Jul. ";
			break;
		case (7):
			monthStr = "Aug. ";
			break;
		case (8):
			monthStr = "Sep. ";
			break;
		case (9):
			monthStr = "Oct. ";
			break;
		case (10):
			monthStr = "Nov. ";
			break;
		case (11):
			monthStr = "Dec. ";
	}
	return monthStr;
}

function padInt (num, padQty)
{
	var intStr = num.toString ();
	if (intStr.length >= padQty) return intStr;
	for (var i = 0;  i < padQty - intStr.length;  i++) {
		intStr = "0" + intStr;
	}
	return intStr;
}

function trimString (str)
{
	if (str == null || str.length == 0) return str;
	while (str.charAt (0) == ' ') {
		str = str.substr (1);
	}
	while (str.charAt (str.length - 1) == ' ') {
		str = str.substr (0, str.length - 1);
	}
	return str;
}

function validateName(name, allowNull)
{
    return ((allowNull == true || (name != null && name.length > 0)) &&
	    name.match(/[^A-Za-z\'\.\-\ ]/) == null);
}

function validateOtherName (name, allowNull) {
	return ((allowNull == true || (name != null && name.length > 0)) &&
	    name.match(/[^A-Za-z0-9\'\.\,\-\ ]/) == null);
}

function validateInitial(initial)
{
    return (initial == null || initial.length == 0 ||
	    (initial.length == 1 &&
	    initial.match(/[A-Za-z]/) != null));
}

// pop up function - full browser functionality, forces non-full screen
// format should be href="javascript:popup('http://www.yahoo.com')"
function popupSmall(content)
{
	var h = screen.height;
	var w = screen.width;
	h = h * .4;
	w = w * .6;
	var loc = "toolbar=1,location=1,status=1,scrollbars=1,resizable=1,width=" + w + ",height=" + h;
	window.open(content,'Information',loc);
}

// pop up function - full browser functionality, forces non-full screen
// format should be href="javascript:popup('http://www.yahoo.com')"
function popupSized(content, width, height)
{
	var loc = "toolbar=1,location=1,status=1,scrollbars=1,resizable=1,width=" + width + ",height=" + height;
	window.open(content,'Information',loc);
}

function popupSizedScrollable(content, width, height)
{
	var loc = "toolbar=0,location=0,status=0,scrollbars=1,resizable=1,width=" + width + ",height=" + height;
	window.open(content,'Information',loc);
}

function popupSizedNoBar(content, width, height)
{
	var loc = "toolbar=0,location=0,status=0,scrollbars=0,resizable=1,width=" + width + ",height=" + height;
	window.open(content,'Information',loc);
}

var wnd = null;
var ielang = navigator.systemLanguage;
/* if (ielang != null) {
  window.onunload = killPopup
}*/
function killPopup() {
	if (wnd != null) wnd.close();
}

function popup(theURL, returnWindow) {
	if (ielang != null && wnd != null && !wnd.closed) {
    	wnd.close();
    /*
     * Case 6523: Some versions of browsers does not like wnd.closed. Removing it seems to have fixed the problem
     * This might have ramifications on slower machines, which I assume is the reason to have included
     * this popup.closed check in the first place.
     */
    //	while(!wnd.closed) { }
  	}
  	var h = screen.height;
	var w = screen.width;
	h = h * .7;
	w = w * .7;
	var loc = "toolbar=1,location=1,status=1,scrollbars=1,resizable=1,width=" + w + ",height=" + h;
	// wnd = window.open(theURL, "popup", "resizable,dependent,scrollbars,width=533,height=400");
    var winName = "popup";
	wnd = window.open(theURL, winName, loc);
	if (wnd != null) {
		//wnd.focus();
	}
    if (returnWindow) {
    	return wnd;
    }
}

function popupNew(theURL, returnWindow) {
	if (ielang != null && wnd != null && !wnd.closed) {
    	wnd.close();
    /*
     * Case 6523: Some versions of browsers does not like wnd.closed. Removing it seems to have fixed the problem
     * This might have ramifications on slower machines, which I assume is the reason to have included
     * this popup.closed check in the first place.
     */
    //	while(!wnd.closed) { }
  	}
  	var h = screen.height;
	var w = screen.width;
	h = h * .7;
	w = w * .7;
	var loc = "toolbar=1,location=1,status=1,scrollbars=1,resizable=1,width=" + w + ",height=" + h;
	// wnd = window.open(theURL, "popup", "resizable,dependent,scrollbars,width=533,height=400");
    var winName = "popup" + Math.round(Math.random()*10000);
    wnd = window.open(theURL, winName, loc);
	if (wnd != null) wnd.focus();
    if (returnWindow) return wnd;
}


function popupsupport(theURL) {
	if (ielang != null && wnd != null && !wnd.closed) {
		wnd.close();
		while(!wnd.closed) { }
	}
	var h = screen.height;
	h = h * .7;
	var loc = "toolbar=1,location=1,status=1,scrollbars=1,resizable=1,width=740,height=" + h;
	// wnd = window.open(theURL, "popup", "resizable,dependent,scrollbars,width=533,height=400");
	wnd = window.open(theURL, "popupsupport", loc);
	if (wnd != null) wnd.focus();
}

// used in _template/problem/problem_edit_excel.jsp
// used in _template/quiz/Quiz_excel.jsp
function popupCM(theURL) {
	if (ielang != null && wnd != null && !wnd.closed) {
    	wnd.close();
    	while(!wnd.closed) { }
  	}
  	var h = screen.height;
	var w = screen.width;
	h = h * .7;
	w = w * .7;
	var loc = "toolbar=1,menubar=1,location=1,status=1,scrollbars=1,resizable=1,width=" + w + ",height=" + h;
	// wnd = window.open(theURL, "popup", "resizable,dependent,scrollbars,width=533,height=400");
	wnd = window.open(theURL, "popupCM", loc);
	if (wnd != null) wnd.focus();
}

function popupFlashPaper(theURL) {
	if (ielang != null && wnd != null && !wnd.closed) {
    	wnd.close();
    /*
     * Case 5752: Some versions of browsers does not like wnd.closed. Removing it seems to have fixed the problem
     * This might have ramifications on slower machines, which I assume is the reason to have included
     * this popup.closed check in the first place.
     */
    //	while(!wnd.closed) { }
  	}
  	var h = screen.height;
	var w = screen.width;
	h = h * .7;
	w = w * .7;
	var loc = "toolbar=0,menubar=0,location=0,status=0,scrollbars=0,resizable=1,width=" + w + ",height=" + h;
	// wnd = window.open(theURL, "popup", "resizable,dependent,scrollbars,width=533,height=400");
	wnd = window.open(theURL, "popupFlashPaper", loc);
	if (wnd != null) {
		wnd.focus();
    }
}

function popupGradebookOneQuestion(theURL, height, width) {
	if (ielang != null && wnd != null && !wnd.closed) {
    	wnd.close();
    /*
     * Case 5752: Some versions of browsers does not like wnd.closed. Removing it seems to have fixed the problem
     * This might have ramifications on slower machines, which I assume is the reason to have included
     * this popup.closed check in the first place.
     */
    //	while(!wnd.closed) { }
  	}
  	var h = screen.height;
	var w = screen.width;
	h = h * .7;
	w = w * .7;
	
	if (height != null && width != null) {
		h = height;
		w = width;
	}
	
	var loc = "toolbar=0,menubar=0,location=0,status=0,scrollbars=1,resizable=1,width=" + w + ",height=" + h;
	wnd = window.open(theURL, "popupGradebookOneQuestion", loc);
	if (wnd != null) {
		wnd.focus();
		return true;
    } else {
    	// FB 55189 - need to let caller know if the window popup failed and have Flex retry launch
    	return false;
    }
}

// rollover function
function roll(reference, img_name)
{
	img_name.src = reference;
}

// preload function
function preloadProfHdr()
{
	var onButtons = new Array('/images/subtab_coursehome_on.gif','/images/subtab_announcements_on.gif', '/images/subtab_assignments_on.gif','/images/subtab_apliamat_on.gif','/images/subtab_coursemat_on.gif','/images/subtab_crsdiscussion_on.gif','/images/subtab_administration_on.gif','/images/subtab_studentview_on.gif','/images/tabs_p_home_on.gif','/images/tabs_p_mycourses_on.gif','/images/tabs_p_contentbrowser_on.gif','/images/tabs_p_discussion_on.gif','/images/tabs_p_myaccount_on.gif');
	preloadMe(onButtons);
}

function preloadMe(onArray)
{
	for(var i = 0; i < onArray.length; i++)
	{
		var onImage = new Image();
		onImage.src = onArray[i];
  	}
}

function validPassword (pwd) {
	//return ((pwd != null && trimString(pwd).length >= 6) &&
	//    	(pwd.match(/[^A-Za-z0-9]/) == null));
	return (
	    (pwd != null) && (pwd.length >= 6) && (trimString(pwd).length > 0)
	        );
}

function getNumberCheckBoxes(checkbox)
{
    var len = checkbox.length;
	if (isNaN (len)) {
		// only one checkbox: not an array
		return 1;
    }
    else
    {
        return len;
    }
}

function getNumberCheckBoxesChecked (checkbox) {
	var count = 0;
	if (checkbox == null) {return count;}
	var len = checkbox.length;
	if (isNaN (len)) {
		// only one checkbox: not an array
		if (checkbox.checked == true) {
			count++;
		}
	} else {
		for (var i = 0; i < len; i++) {
			if (checkbox[i].checked == true) {
				count++;
			}
		}
	}
	return count;
}


function checkAll (checkbox) {
	if (checkbox == null) {return;}
	var len = checkbox.length;
	if (isNaN (len)) {
		// only one checkbox: not an array
		checkbox.checked = true;
	} else {
		for (var i = 0; i < len; i++) {
			checkbox[i].checked = true;
		}
	}
}

function uncheckAll (checkbox) {
	if (checkbox == null) {return;}
	var len = checkbox.length;
	if (isNaN (len)) {
		// only one checkbox: not an array
		checkbox.checked = false;
	} else {
		for (var i = 0; i < len; i++) {
			checkbox[i].checked = false;
		}
	}
}

function toggleChecked (checkbox) {
	if (checkbox == null) {return;}
	var len = checkbox.length;
	if (isNaN (len)) {
		// only one checkbox: not an array
		checkbox.checked = !checkbox.checked;
	} else {
		for (var i = 0; i < len; i++) {
			checkbox[i].checked = !checkbox[i].checked;
		}
	}
}

function isRadioChecked (radio) {
    if (radio == null) {return false;}
    var len = radio.length;
    if (isNaN (len)) {
        return radio.checked;
    } else {
        var checked = false;
        for (var i = 0; i < radio.length; i++) {
            if (!checked && radio[i].checked) {
                checked = true;
            }
        }
        return checked;
    }
}

function getRadioValue(radio) {
    for (i=0; i<radio.length; i++) {
        if (radio[i].checked) {
            return radio[i].value;
        }
    }
    return '';
}

function writeHiddenInput (doc, checkbox, name)
{
    if (checkbox == null) {return;}
    var len = checkbox.length;
    if (isNaN (len)) {
        // only one checkbox: not an array
        if (checkbox.checked) {
            doc.write ("<input type='hidden' name='" + name + "' value='" + checkbox.value + "'>");
        }
    } else {
        for (var index = 0; index < len; index++) {
            if (checkbox[index].checked) {
                doc.write ("<input type='hidden' name='" + name + "' value='" + checkbox[index].value + "'>");
            }
        }
    }
}

function setOption(option, value)
{
	var len = option.length;
	for(var x=0; x < len; x++)
	{
		if (option[x].value == value)
		{
			option[x].selected = true;
			break;
		}
	}
}

function escapeApostrophes(str)
{
    return (str.replace(/[\']/g, "*"));
}

function unescapeApostrophes(str)
{
    return (str.replace(/[\*]/g, "'"));
}

function writeMe(str)
{
	document.write(str);
}

function textAreaLength(textArea)
{
    nPattern = /[\n]/g;
    rPattern = /[\r]/g;
    if (textArea != null && textArea.value != null)
	{
	    var nCount = instanceCount(nPattern, textArea.value);
	    var rCount = instanceCount(rPattern, textArea.value);

	    var dif = Math.abs(nCount - rCount);

	    return textArea.value.length + dif;
	}

	return 0;
}

function instanceCount(pattern, str)
{
    var count = 0;
    var m = null;

    m = str.match(pattern);
    if (m != null)
    {
        count = m.length;
    }

    return count;
}

/**
    Inserts a given option (opt) into an existing list (list) at the specified index (index)
    if index <= 0, inserts option at beginning of list
    if index >= list length, inserts at the end
*/
function insertOption (list, index, opt)
{
    if (index < 0) index = 0;   // if index less than 0 add to beginning of list

    // get list size
    var len = list.options.length;

    if (index >= len)   // if index equal or greater than length, add to end
    {
        list.options[len] = opt;
    }
    else    // add to index and push all items after down
    {
        var opts = list.options;
        opts[len] = new Option (opts[len-1].text, opts[len-1].value, opts[len-1].defaultSelected, opts[len-1].selected);
        for(i=len-1;i>index;i--)
        {
            opts[i] = new Option(opts[i-1].text, opts[i-1].value, opts[i-1].defaultSelected, opts[i-1].selected);
        }
        opts[i] = opt;
    }
}

function listContainsValue(list, value)
{
    return (listValueIndex(list, value) > -1);
}

function listValueIndex(list, value)
{
    var len = list.length;
    for(var i = 0; i < list.length; i++)
    {
        if(list.options[i].value == value)
        {
            return i;
        }
    }

    return -1;
}

function removeOption(list, value)
{
    var index = listValueIndex(list, value);
    if (index > -1)
    {
        list.options[index] = null;
    }
}

function enableRadio(radioArray,enable)
{
    var len = radioArray.length;
    if (isNaN(len))
    {
        radioArray.disabled = !enable;
    }
    else
    {
        for(var i=0;i<radioArray.length;i++)
        {
            radioArray[i].disabled = !enable;
        }
    }
}

function _hideObject(obj){
	if (obj!=null){
		obj.style.display="none";
	}
}

function _showObject(obj){
	if (obj!=null){
		obj.style.display="inline";
	}
}

var __isDivOpened = true;
function toggleImage(targetDivId, imageId, imageSrcClose, imageSrcOpen) {
    var targetDiv = document.getElementById(targetDivId);
    var targetImg = document.getElementById(imageId);
	if (__isDivOpened) {
		// close it
		targetDiv.style.display = "none";
		// switch to open
		targetImg.src = imageSrcClose;
		__isDivOpened = false;
		setCookie("collapsedCourseReading", true, 3 ,90); // from cookies.js
	} else {
		// open div
		targetDiv.style.display = "inline";
		// switch to close
		targetImg.src = imageSrcOpen;
		__isDivOpened = true;
		deleteCookie("collapsedCourseReading"); // from cookies.js
	}


}

/* Javascript alert and confirm handling */
function initDialogAlert() {
	YAHOO.namespace("alerthandling");
	
	YAHOO.alerthandling.alert = 
		new YAHOO.widget.SimpleDialog("alert", 
				 { width: "300px",
				   fixedcenter: true,
				   visible: false,
				   draggable: false,
				   modal: true,
				   close: false,
				   constraintoviewport: true,
				   buttons: [ { text: "OK", handler: handleOK } ]
				 } );
}

// event handler for the alert dialog
var handleOK = function() {
	this.hide();
	if (handleAlert != null)
		handleAlert();
};

function jsAlert(msg, function_after_alert) {
	// initialize the alert dialog
	initDialogAlert();
	
	handleAlert = function_after_alert;
	YAHOO.alerthandling.alert.setHeader("Alert");
	YAHOO.alerthandling.alert.setBody(msg);
	
	// render and show the alert dialog
	YAHOO.alerthandling.alert.render(document.body);
	YAHOO.alerthandling.alert.show();
}

function initDialogConfirm() {
	YAHOO.namespace("alerthandling");
	
	YAHOO.alerthandling.confirm = 
		new YAHOO.widget.SimpleDialog("confirm", 
				 { width: "300px",
				   fixedcenter: true,
				   visible: false,
				   draggable: false,
				   modal: true,
				   close: false,
				   constraintoviewport: true,
				   buttons: [ { text: "&nbsp;No&nbsp;", handler: handleNo }, { text: "Yes", handler: handleYes } ]
				 } );
}

// event handlers for the confirm dialog
var handleYes = function() {
	this.hide();
	handleConfirm();
};

var handleNo = function() {
	this.hide();
};

function jsConfirm(msg, function_if_confirm, fun) {
	// initialize the confirm dialog
	initDialogConfirm();
	
	handleConfirm = function_if_confirm;
	YAHOO.alerthandling.confirm.setHeader("Are you sure?");
	YAHOO.alerthandling.confirm.setBody(msg);
	
	// render and show the confirm dialog
	YAHOO.alerthandling.confirm.render(document.body);
	YAHOO.alerthandling.confirm.show();
}

function checkEnterKeyPress(e) {
	var keycode;
	if (navigator.appName.indexOf("Microsoft") != -1)
		keycode = window.event.keyCode;
	else
		keycode = e.which;
	
	if (keycode == 13) {
		// do nothing
		return false;
   }
	else
	   return true;
}

/* Aplia Text */
function toggleFlipbook(isbn, chapter_id, module_id){
	var swf = document.getElementById("flipbook");
	if(swf.className == "flipbook-closed") {
		// open the flipbook div
		swf.className = "";
		// toggle the image
		document.getElementById("textbookImg").src = "/images/apliatext/close_textbook.gif";
		document.getElementById("textbookImg").width= "144";
		document.getElementById("textbookImg").height= "30";
		document.getElementById("textbookImg").alt= "Close Textbook";
		// embed the flipbook
		embedFlipbook(isbn, chapter_id, module_id, controller);
	} else {
		// close the flipbook div
		swf.className = "flipbook-closed";
		// toggle the image
		document.getElementById("textbookImg").src = "/images/apliatext/read_textbook.gif";
		document.getElementById("textbookImg").width= "141";
		document.getElementById("textbookImg").height= "30";
		document.getElementById("textbookImg").alt= "Read Textbook";
	}
}

function launchApliaText(module) {
	var theURL = "/af/servlet/apliatext?action=launch&module=" + module;
	if (ielang != null && wnd != null && !wnd.closed) {
    	wnd.close();
  	}
	
	var wndName = window.location.hostname;
	wndName = "atext_" + wndName.substring(0, wndName.indexOf("."));
	
	var h = screen.height * .8;
	var w = 765;
	var loc = "toolbar=1,location=1,status=1,scrollbars=1,resizable=1,width=" + w + ",height=" + h;
	if (navigator.userAgent.toLowerCase().indexOf('chrome') > -1)
		loc += ",menubar=0";
	else
		loc += ",menubar=1";
	
	wnd = window.open(theURL, wndName, loc);
	if (wnd != null) {
		wnd.focus();
    }
}

function popupApliaText(i, c, m, s) {
	if (s == null)
		s = "";
	else
		s = atextURLEncode(s);
	
	var theURL = "/af/servlet/apliatext?action=popup&i=" + i + "&c=" + c + "&m=" + m + "&s=" + s;
	if (ielang != null && wnd != null && !wnd.closed) {
    	wnd.close();
  	}
	
	var wndName = window.location.hostname;
	wndName = "atext_" + wndName.substring(0, wndName.indexOf("."));
	
	var h = screen.height * .8;
	var w = 765;
	var loc = "toolbar=1,location=1,status=1,scrollbars=1,resizable=1,width=" + w + ",height=" + h;
	if (navigator.userAgent.toLowerCase().indexOf('chrome') > -1)
		loc += ",menubar=0";
	else
		loc += ",menubar=1";
	
	wnd = window.open(theURL, wndName, loc);
	if (wnd != null) {
		wnd.focus();
    }
}

function atextURLEncode(s) {
	var SAFECHARS = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz-_.!~*'()";
    var HEX = "0123456789ABCDEF";

    var plaintext = s;
    var encoded = "";
    for (var i = 0; i < plaintext.length; i++ ) {
        var ch = plaintext.charAt(i);
        if (ch == " ") {
            encoded += "+"; // x-www-urlencoded, rather than %20
        } else if (SAFECHARS.indexOf(ch) != -1) {
            encoded += ch;
        } else {
            var charCode = ch.charCodeAt(0);
            if (charCode > 255) {
                encoded += "+";
            } else {
                encoded += "%";
                encoded += HEX.charAt((charCode >> 4) & 0xF);
                encoded += HEX.charAt(charCode & 0xF);
            }
        }
    }
    var retVal = "" + encoded;
    return retVal;
}


function getSwf(id) {
    if (navigator.appName.indexOf("Microsoft") != -1) {
        return window[id];
    } 
    else {
        return document[id];
    }
}

function HtmlDecode(s) {
	var out = "";
	if (s==null) return;
	
	var l = s.length;
	for (var i=0; i<l; i++) {
		var ch = s.charAt(i);
		
		if (ch == '&') {
			var semicolonIndex = s.indexOf(';', i+1);
			
			if (semicolonIndex > 0) {
				var entity = s.substring(i + 1, semicolonIndex);
				if (entity.length > 1 && entity.charAt(0) == '#') {
					if (entity.charAt(1) == 'x' || entity.charAt(1) == 'X')
						ch = String.fromCharCode(eval('0'+entity.substring(1)));
					else
						ch = String.fromCharCode(eval(entity.substring(1)));
					}
					else {
						switch (entity) {
							case 'quot': ch = String.fromCharCode(0x0022); break;
							case 'amp': ch = String.fromCharCode(0x0026); break;
							case 'lt': ch = String.fromCharCode(0x003c); break;
							case 'gt': ch = String.fromCharCode(0x003e); break;
							case 'nbsp': ch = String.fromCharCode(0x00a0); break;
							case '#39': ch = '\\'; break;
							default: ch = ''; break;
						}
					}
					i = semicolonIndex;
				}
			}
		
			out += ch;
		}

	return out;
}

function getUrlParam(name) {
	name = name.replace(/[\[]/,"\\\[").replace(/[\]]/,"\\\]");
	var regexS = "[\\?&]"+name+"=([^&#]*)";
	var regex = new RegExp( regexS );
	var results = regex.exec( window.location.href );
	if( results == null )
		return "";
	else
		return results[1];
}

function getIEVersion() {
	//Returns the version of Internet Explorer or a -1
	//(indicating the use of another browser).
	var rv = -1; // Return value assumes failure.
	if (navigator.appName == 'Microsoft Internet Explorer') {
	 var ua = navigator.userAgent;
	 var re  = new RegExp("MSIE ([0-9]{1,}[\.0-9]{0,})");
	 if (re.exec(ua) != null)
	   rv = parseFloat( RegExp.$1 );
	}
	return rv;
}