// List image names without extension
var myImg= [ 
   "pix1",
   "pix2",
   "pix3",
   "pix4",
   "pix5",
   "pix6",
   "pix7",
   "pix8",
   "pix9",
   "pix10",
   "pix11",
   "pix12",
   "pix13",
   "pix14",
   "pix15"
   ];
// Tell browser where to find the image
myImgSrc = "images/";
// Tell browser the type of file
myImgEnd = ".jpg"
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(){
 i = ( i + 1 ) % myImg.length;
    loadImg();
}
// Load function after page loads
window.onload=loadImg;