JavaScript - First Post Here, Need Help On Js Slideshow

var mySlideShow = document.getElementById("slideShow");

var imageArray=new Array(); 
imageArray[0]="url(images/Slide1.JPG)";       
imageArray[1]="url(images/Slide2.JPG)";
imageArray[2]="url(images/Slide3.JPG)";


var imageIndex = 0;

var leftArrow = document.getElementById("left");
var rightArrow = document.getElementById("right");

mySlideShow.style.backgroundImage = "url(images/Slide1.JPG";


function changeRight  () {

mySlideShow.style.backgroundImage = imageArray[imageIndex];
imageIndex++;


	if (imageIndex >= imageArray.length) {
	imageIndex = 1;


	
	}
	
	console.log(imageIndex);
	
}


function changeLeft  () {

mySlideShow.style.backgroundImage = imageArray[imageIndex];
imageIndex--;
console.log(imageIndex);
	
}




rightArrow.onclick = function() {
	
	changeRight();
	
	}
	
leftArrow.onclick = function() {
	
	changeLeft();
	
}

<div id="imageBox">

                <!-- Random Images -->

                <img src="images/image1.jpg" width="200" height="200" alt="School Images" id="randImage" />

                        </div>

window.onload = pics;

var thisPic = 0;

 

        var schoolImages = new Array("images/image1.jpg", "images/image2.jpg", "images/image3.jpg", "images/image4.jpg", "images/image5.jpg");

 

function pics(){

 

       

        thisPic = Math.floor((Math.random() * schoolImages.length));

       

        document.getElementById('randImage').src = schoolImages[thisPic];      

       

        cycle();

       

       

}

 

function cycle(){

       

        thisPic++;

       

        if(thisPic == schoolImages.length){

                thisPic = 0;

        }

       

        document.getElementById('randImage').src = schoolImages[thisPic];

       

        setTimeout(cycle, 3 * 1000);
               
     
}

function getStyle(object, styleName) {
   if (window.getComputedStyle) {
      return document.defaultView.getComputedStyle(object, null).getPropertyValue(styleName);
   } else if (object.currentStyle) {
      return object.currentStyle[styleName]
   }
}

// step 3
function addEvent(object, evName, fnName, cap) {
   if (object.attachEvent)
       object.attachEvent("on" + evName, fnName);
   else if (object.addEventListener)
            object.addEventListener(evName, fnName, cap);
}
//step 4
function addEvent(object, evName, fnName, cap) {
   if (object.detachEvent)
       object.detachEvent("on" + evName, fnName);
   else if (object.removeEventListener)
            object.removeEventListener(evName, fnName, cap);
}

/*
   New Perspectives on JavaScript, 2nd Edition
   Tutorial 6
   Case Problem 2

   Author:  
   Date:    

   Filename: slideshow.js


   Global Variables:
  
   scrollButton
      References the scrolling button in the slide show

   diffX
      Stores the horizontal distance in pixels between the
      mouse pointer when the scrolling button is clicked
      and the left edge of the scrolling button.

   Functions List:

   setup()
      Initializes the contents of the Web page. Creates
      event handlers for the mouse and keyboard events

   grabIt(e)
      "Grabs" the scrolling button to set up the
       horizontal scrolling of the slide show

   moveIt(e)
      Moves the scrolling button horizontally through
      the scrollbar

   showSlide(x)
      Shows the image corresponding the to the x coordinate
      on the scrollbar

   dropIt(e)
      Drops the scrolling button after the user releases the
      mouse button

   keyShow(e)
      Uses the left and right arrow keys to move the scrolling
      button through the scrollbar

*/

var scrollButton;
var diffX;
// step 7
function setup(){
	scrollButton = document.getElementById("button");
	scrollButton.style.top = getStyle(scrollButton,"top");
	scrollButton.style.left = getStyle(scrollButton,"left");
	scrollButton.style.cursor = "pointer";
	addEvent(scrollButton, "mousedown", grabIt, false);
	addEvent(document, "keydown", keyShow, false);
}	
// step 8
function grabIt(e){
	var evt = e || window.event;
	var mouseX = evt.clientX;
	diffX = parseInt(scrollButton.style.left)- mouseX;
	addEvent(scrollButton, "mousemove", moveIt, false);
	addEvent(scrollButton, "mouseup", dropIt, false);
}
// step 9
function moveIt(e){
	var evt = e || window.event;
	var mouseX = evt.clientX;
	var buttonPosX = mouseX - diffX;
	showSlide();
}
// step 10
function showSlide(x){
	if(x<20){
		x = 20;
	}
	if(x>299){
		x = 299;
	}
	scrollButton.style.left = x;
	var i = Math.floor((x-20)/31);
	document.getElementById("photo").src = image[i];
}
// step 11
function dropIt(e){
	removeEvent(scrollButton, "mousemove", moveIt, false);
}
// step 12
function keyShow(e){
	var evt = e || window.event;
	var key = event.keyCode;
	var buttonPosX = scrollButton.style.left;
	if(key == 37) buttonPosX -= 31;
	if(key == 39) buttonPosX += 31;
	showSlide(buttonPosX);
}

 intervalID = setInterval(makeScroll, 4000);
function makeScroll()
{
    var rand_no = Math.floor(11*Math.random());
    if (rand_no < 5)
        {
            $('#slides > .next > a').click();
        }
    else
        {
            $('#slides > .back > a').click();
        }

<script type="text/javascript">

if (document.all || document.getElementById){ //if IE4 or NS6+
 document.write('<style type="text/css">\n');
 document.write('.dyncontent{display: none; \n');
 document.write('</style>');
}

var curcontentindex=0;
var messages=new Array();

function getElementByClass(classname){
 var inc=0;
 var alltags=document.all? document.all : document.getElementsByTagName("*");
 for (i=0; i<alltags.length; i++){
   if (alltags[i].className==classname)
     messages[inc++]=alltags[i];
 }
}

function rotatecontent(){
 //get current message index (to show it):
 curcontentindex=(curcontentindex<messages.length-1)? curcontentindex+1 : 0;
 //get previous message index (to hide it):
 prevcontentindex=(curcontentindex==0)? messages.length-1 : curcontentindex-1;
 messages[prevcontentindex].style.display="none"; //hide previous message
 messages[curcontentindex].style.display="block"; //show current message
}

window.onload=function(){
 if (document.all || document.getElementById){
   getElementByClass("dyncontent");
   setInterval("GetCount()", 1000);
   setInterval("rotatecontent()", 5000);
 }
}

</script>

<!--// Rolling Spotlight Program //-->

<div class="dyncontent" style="display: block">
Number1
</div>

<div class="dyncontent" >Number2
</div>

<div class="dyncontent" >Number3
</div>

<!--// END OF THE SPOTLIGHT ROLLER //-->