/*CHAPTER 4 CODE BEGINS HERE*/

/* Browser Detection Script begins here. */
/* The variable theDOM1 will be true for modern browsers. */
var theDOM1 = (document.getElementById) ? true : false;

/* theApp will contain the browser name */
var theApp = navigator.appName.toLowerCase();

/* UA (user agent) contains detailed browser info. For example, UA for Internet Explorer on Mac would be 'mozilla/4.0 (compatible; msie 5.0; mac_powerpc)' */
var UA = navigator.userAgent.toLowerCase();

/* variables for the two major browsers in existence today. */
var isIE = (UA.indexOf('msie') >= 0) ? true : false;
var isNS = (UA.indexOf('mozilla') >= 0) ? true : false;

/* 'compatible' text string is only in non-Netscape browsers */
if (UA.indexOf('compatible')>0){
    isNS = false;
}

/* platform */
var thePlatform = navigator.platform.toLowerCase();
var isMAC = (UA.indexOf('mac') >= 0) ? true : false;
var isWIN = (UA.indexOf('win') >= 0) ? true : false;

/* Most UNIX users use X-Windows so this detects UNIX most of the time.*/
var isUNIX = (UA.indexOf('x11') >= 0) ? true : false;

/* browser version */
var version = navigator.appVersion;
var isMajor = parseInt( version );
/* Internet Explorer version 5 on the Mac reports itself as version 4. This code corrects the problem. */
if(isIE && isMAC) {
    if(UA.indexOf("msie 5")) {
        isMajor = 5;
        var stringLoc = UA.indexOf("msie 5");
        version = UA.substring(stringLoc + 5, stringLoc + 8);
    }
}
/* Internet Explorer version 6 on Windows reports itself as version 4. This code corrects the problem. */
if(isIE && isWIN) {
    if(UA.indexOf("msie 6")) {
        isMajor = 6;
        var stringLoc = UA.indexOf("msie 6");
        version = UA.substring(stringLoc + 5, stringLoc + 8);
    }
    if(UA.indexOf("msie 5.5")) {
        isMajor = 5;
        var stringLoc = UA.indexOf("msie 5.5");
        version = UA.substring(stringLoc + 5, stringLoc + 8);
    }
}
/* Netscape 6 reports itself as version 5 on all platforms.
   This code corrects the problem. */
if(isNS && isMajor>4) {
    if(UA.indexOf("netscape6")) {
        isMajor = 6;
        var stringLoc = UA.indexOf("netscape6");
        version = UA.substring(stringLoc + 10, stringLoc + 14);
    }
}
var isMinor = parseFloat( version );

/* a function to report browser info */
function getBrowserInfo(){
    var temp="<p>";
    temp += "User Agent: " + UA + "<br>";
    temp += "Platform: " + thePlatform + "<br>";
    temp += "Macintosh: " + isMAC + "<br>";
    temp += "Windows: " + isWIN + "<br>";
    temp += "Application: " + theApp + "<br>";
    temp += "Version: " + version + "<br>";
    temp += "Netscape: " + isNS + "<br>";
    temp += "Internet Explorer: " + isIE + "<br>";
    temp += "Major Version: " + isMajor + "<br>";
    temp += "Full Version: " + isMinor + "<br>";
    temp += "<br>";
    
    if (theDOM1){
		temp += "You appear to have a modern browser.<br>";
        temp += "Netscape 6, IE 6, or IE5Mac are recommended.";
    }else{
        temp += "Alert! Your browser is obsolete.<br>";
        temp += "You may enjoy the Web more if you upgrade.";        
    }
    temp +="<\/p>";
    return temp;
}
/* End of browser detection code */


/* Convert object name string or object reference
   into a valid object reference */
function getObj(elementID){
	if (typeof elementID == "string") {
		return document.getElementById(elementID);
	}else{
		return elementID;		
	}
}
/* Object Motion and Position Scripts */
/*This function places a positionable object (obj) in 
  three dimensions (x,y, and z).*/
function shiftTo(obj,x,y,z){
	var newObj = getObj(obj)
	newObj.style.left = x + "px";
	newObj.style.top = y + "px";
	newObj.style.zIndex = z;
}
/*This function gets the x coordinate of a positionable object.*/
function getObjX(obj){
	return parseInt(getObj(obj).style.left);
}
/*This function gets the y coordinate of a positionable object.*/
function getObjY(obj){
	return parseInt(getObj(obj).style.top);
}
/*This function gets the z-index of a positionable object.*/
function getObjZ(obj){
	return parseInt(getObj(obj).style.zIndex);
}
/*The emptyNode() function loops through the array of child nodes and removes each one.*/
function emptyNode(elementID){
	var theNode = getObj(elementID);
	for (i=0;i<theNode.childNodes.length;i++){
		theNode.removeChild(theNode.childNodes[i]);
	}
}

/*This function gets the available width of the window.*/
function getAvailableWidth(){
	var theWidth=null;
	/*Netscape uses window.innerWidth */
	if (window.innerWidth) {
		theWidth = window.innerWidth;
	}
	/*IE uses document.body.clientWidth */
	if (document.body.clientWidth) {
		theWidth = document.body.clientWidth;
	}
	return theWidth;
}

/*This function gets the available height of the window.
  IE6.0 on Windows has a bug and returns null.*/
function getAvailableHeight(){
	var theHeight = null;
	/*Netscape uses window.innerHeight */
	if (window.innerHeight) {
		theHeight = window.innerHeight;
	}
	/*IE uses document.body.clientHeight */
	if (document.body.clientHeight) {
		theHeight = document.body.clientHeight;
	}
	return theHeight;
}
/*This function sets the total height and width of the window.*/
function setWindowSize(w,h){
	window.resizeTo(w,h);
}
/*This function sets the size of the window to cover all of the screen.*/
function maximizeWindow(){
	window.moveTo(0,0);
	window.resizeTo(screen.availWidth,screen.availHeight);
}
/*END OF CHAPTER 4 CODE*/

/*CHAPTER 5 CODE BEGINS HERE.*/

/* Redirects visitors who are using outdated browsers.*/
function checkDOM(newlocation){
	if (!theDOM1){
		window.location.replace(newlocation);
	}
}
/* This function changes the cursor. 
   The second argument is optional. */
function setCursor(cursortype,thisobj){
	if (UA.indexOf("msie 5")>=0){
		if (cursortype == 'pointer') { cursortype='hand'; }
	}
    if (thisobj==null){
    	document.body.style.cursor = cursortype;
    }else{
    	getObj(thisobj).style.cursor = cursortype;
    }
}
/*Set the background color of an object*/
function setBackground(thisobj, color){
	getObj(thisobj).style.background = color;
}

/*Set the text color of an object*/
function setColor(thisobj, color){
	getObj(thisobj).style.color = color;
}
/*Setting the visibility of an object*/
function setVisibility(obj,vis){
	var theObj = getObj(obj);
	if (vis == true || vis=='visible' || vis=='y'){
		theObj.style.visibility = "visible";
	}else{
		theObj.style.visibility = "hidden";
	}
}
/*Getting the visibility of an object*/
function isVisible(obj) {
	var theObj = getObj(obj);
	return theObj.style.visibility;
}

/*Setting the display of an object*/
function setDisplay(obj,dis){
	var theObj = getObj(obj);
	if (dis==true || dis=='block' || dis=='y'){
		theObj.style.display = "block";
	}else{
		if (dis==false || dis=='n'){
			theObj.style.display = "none";
		}else{
			theObj.style.display = dis;
		}
	}
}
/*Getting the display of an object*/
function isDisplayed(obj) {
	var theObj = getObj(obj);
	return theObj.style.display;
}


/*Set the clip region of an object*/
function setClip(obj,top,right,bottom,left){
	var theObj = getObj(obj);
	var r = 'rect('+top+'px,'+right+'px,'+bottom+'px,'+left+'px)';
	theObj.style.clip = r;
}


/*CHAPTER 6 CODE BEGINS HERE*/

function showxy(evt){
	if (window.event){ evt = window.event; }
	if (evt){
		var pos = evt.clientX + ", " + evt.clientY;
		window.status=pos;
	}
}

function checkModel(evt){
	if (window.event){
		alert("This browser uses the IE4+ event model.");
	}else{
		if (evt){ 
			alert("This browser uses the W3C/Netscape6 event model.");
		}
	}
}


/*Getting the width of an object*/
function getWidth(obj){
	var theObj = getObj(obj);
	if (theObj.clientWidth){
		return parseInt(theObj.clientWidth);
	}
	if (theObj.offsetWidth){
		return parseInt(theObj.offsetWidth);		
	}
}

/*Getting the Height of an object*/
function getHeight(obj){
	var theObj = getObj(obj);
	if (theObj.clientHeight){
		return parseInt(theObj.clientHeight);
	}
	if (theObj.offsetHeight){
		return parseInt(theObj.offsetHeight);		
	}
}


/*Drag and Drop Script for positioned divs and spans*/
/*Place this in your codelibrary.js file for future use.*/
var maxZdrag = document.getElementsByTagName("div").length;
	maxZdrag += document.getElementsByTagName("span").length;
var dragElem=null;
var dragging=false;

function setDrag(evt,elementID){
	dragElem=getObj(elementID);
	startDrag();
}
function startDrag() {
	dragging=true;
	document.onmousemove=dragObj;
	document.onmouseup=dropObj;
}
function dragObj(evt) {
	if (window.event){ evt = window.event; }
	if (evt){
		var x = evt.clientX - parseInt(getWidth(dragElem)/2);
		var y = evt.clientY - parseInt(getHeight(dragElem)/2);
		var z = maxZdrag++;
		shiftTo(dragElem,x,y,z);
		var pos = "drag coordinates are: " + x + ", " + y + ", " + z;
		window.status=pos;
	}
	return false;
}
function dropObj() {
	dragging=false;
	document.onmousemove=null;
	document.onmouseup=null;
	window.status="";
}
/*End Drag and Drop Script*/
/*End of Chapter 6 Code*/

/*Chapter 7 code*/
/*Utility function to convert decimal to hexadecimal*/
function getHex(base10){
	if (base10>255){base10=255;}
	var hexSet = "0123456789abcdef";
	var theMod = base10 % 16; 
	var theRemainder = (base10 - theMod)/16;
	var hexNum = hexSet.charAt(theMod) + "";
	hexNum += hexSet.charAt(theRemainder);
	return hexNum;
}
/*End of Chapter 7 code*/

/* Extra functions you may find useful in your work.*/
/* Many of these functions are from The Web Wizard's Guide to JavaScript.*/

/*Setting the width of an object*/
function setWidth(obj,w){
	var theObj = getObj(obj);
	theObj.style.width = w + "px";
}
/*Setting the height of an object*/
function setHeight(obj,h){
	var theObj = getObj(obj);
	theObj.style.height = h + "px";
}

/* Code to manipulate values from form objects */
function getRadioValue(formname,radioname){
    var theRadioButtons = document[formname][radioname];
    for (i=0;i<theRadioButtons.length;i++){
        if (theRadioButtons[i].checked){
            return theRadioButtons[i].value;
        }
    }
}

function showRadioValue(formname,radioname,thevalue){
    var theRadioButtons = document[formname][radioname];
    for (i=0;i<theRadioButtons.length;i++){
        var temp = theRadioButtons[i].value;
        if (temp == thevalue){
            theRadioButtons[i].checked = true;
        }
    }   
}

function getSelectValue(formname,selectname){
    var theMenu = document[formname][selectname];
    var selecteditem = theMenu.selectedIndex;
    return theMenu.options[selecteditem].value;
}

function showSelectValue(formname,selectname,thevalue){
    var theMenu = document[formname][selectname];
    for (i=0;i<theMenu.options.length;i++){
        var temp = theMenu.options[i].value;
        if (temp == thevalue){
            theMenu.selectedIndex = i;
        }
    }   
}

/* End of code to manipulate values from form objects */

/* Essential Arrays for pages with calendars */
var theDays = new Array();
theDays[0]="Sunday";
theDays[1]="Monday";
theDays[2]="Tuesday";
theDays[3]="Wednesday";
theDays[4]="Thursday";
theDays[5]="Friday";
theDays[6]="Saturday";

var theMonths = new Array();
theMonths[0]="January";
theMonths[1]="February";
theMonths[2]="March";
theMonths[3]="April";
theMonths[4]="May";
theMonths[5]="June";
theMonths[6]="July";
theMonths[7]="August";
theMonths[8]="September";
theMonths[9]="October";
theMonths[10]="November";
theMonths[11]="December";
/* End of date code */

/* Beginning of Cookie Code Based on code by Bill Dortch
   of hidaho designs who has generously placed it in the public domain.*/
function SetCookie(name,value,expires,path,domain,secure){
	var temp = name + "=" + escape(value);
	if (expires){
		temp += "; expires=" + expires.toGMTString();
	}
	if (path){
		temp += "; path=" + path;
	}
	if (domain){
		temp += "; domain=" + domain;
	}
	if (secure){
		temp += "; secure";
	}
	document.cookie = temp;
}
function GetCookie(name){
	var arg = name + "=";
	var alen = arg.length;
	var clen = document.cookie.length;
	var i = 0;
	while (i < clen) {
		var j = i + alen;
		if (document.cookie.substring(i,j) == arg){
			return getCookieVal(j);
		}
		i = document.cookie.indexOf(" ", i) + 1;
		if (i == 0) break;
	}
	return null;
}
function getCookieVal(offset){
	var endstr = document.cookie.indexOf(";", offset);
	if (endstr == -1){
		endstr = document.cookie.length;
	}
	return unescape(document.cookie.substring(offset,endstr));
}
function DeleteCookie (name,path,domain) {
  if (GetCookie(name)) {
    var temp = name + "=";
    temp += ((path) ? "; path=" + path : "");
    temp += ((domain) ? "; domain=" + domain : "");
    temp += "; expires=Thu, 01-Jan-70 00:00:01 GMT";
    document.cookie = temp;
  }
}
/* End of Cookie Code */

/* converts days to milliseconds */
function daysToMS(days){
	return days * 24 * 60 * 60 * 1000;
}

/* converts weeks to milliseconds */
function weeksToMS(weeks){
	return weeks * 7 * 24 * 60 * 60 * 1000;
}

/* converts years to milliseconds */
function yearsToMS(years){
	return years * 365.25 * 24 * 60 * 60 * 1000;
}

/* code to open a new window with various features */
var myWindow = null;
function openWin(url,targetname,W,H,L,T,thefeatures) {
    var params = "";
    var nofeatures = "toolbar=0,location=0,directories=0,status=0,";
    nofeatures += "menubar=0,scrollbars=0,resizable=0,copyhistory=0";
    var basicfeatures = "scrollbars=1,resizable=1,menubar=1 ";
    var morefeatures = "toolbar=1,location=1,directories=1,";
	morefeatures += "status=1,copyhistory=1";
    var dimensions = "width=" + W + ",height=" + H;
    /* The placement variable contains values for left/top and screenX/screenY. Use both to ensure compatibility with all browsers. */
    var placement = "left="  + L + ",top=" + T;
    placement += ",screenX="  + L + ",screenY=" + T;
    
    /* The switch control structure makes decisions that depend on the value of a variable. In this case the value of the parameter variable thefeatures determines the value of the variable params. */
    switch (thefeatures){
        case "none":
            params += nofeatures;
            break;
        case "basic":
            params += basicfeatures;
            break;
        case "full":
            params += basicfeatures + "," + morefeatures;
            break;
        default:
            params += thefeatures;
    }
    /* Adds the dimensions and placement info to the params variable. */
    params += "," + dimensions + "," + placement;
    /* The window.open()method  creates myWindow. */
    myWindow = window.open(url,targetname,params);
}

function closeWin(){
    if (myWindow != null){
        myWindow.close();
        myWindow = null;    
    }
}
/* End of openWin() and closeWin() functions */

//The rand function takes a number as a parameter and returns
//a random number between 1 and that number. 
//The Math.random method generates a random number between 0 and 1.
//That number is then multiplied by the passed parameter.
//1 is added to the product to avoid yielding a zero.
//The Math.floor method then deletes everything after the decimal point.

function rand(num){
	var temp = Math.floor(Math.random() * num) + 1;
	return temp;
}


function goPage(theMenu){
    var selecteditem = theMenu.selectedIndex;
    var URL = theMenu.options[selecteditem].value;
    window.location.href=URL;
}



/* End of codelibrary.js */