// JavaScript Document

var myImg= new Array(3)
  myImg[0]= "job01";
  myImg[1]= "job02";
  myImg[2]= "job03";
  myImg[3]= "job04";

// Tell browser where to find the image
myImgSrc = "images/";

// Tell browser the type of file
myImgEnd = ".gif"

var i = 0;

// Create function to load image
function loadImg(){
  document.imgSrc.src = myImgSrc + myImg[i] + myImgEnd;
}

// Create link function to switch image backward
function prev(){
  if(i<1){
    var l = i
  } else {
    var l = i-=1;
  }
  document.imgSrc.src = myImgSrc + myImg[l] + myImgEnd;
}

// Create link function to switch image forward
function next(){
  if(i>2){
    var l = i
  } else {
    var l = i+=1;
  }
  document.imgSrc.src = myImgSrc + myImg[l] + myImgEnd;
}

// Load function after page loads
window.onload=loadImg;