//index.js

var imgList = new Array(
  "images/polaroidCh-1.jpg",
	"images/polaroidCh-2.jpg",
	"images/polaroidCh-3.jpg",
	"images/polaroidCh-4.jpg"
);

var frame = 0;      
var spriteImage;
      
function init(){
  setInterval("animate()", 2000);
  spriteImage = document.getElementById("page_image");
} // end init
      
function animate(){
	frame += 1;
	if (frame > (imgList.length-1)){
		frame = 0;
	} // end if
	spriteImage.src = imgList[frame];
} // end animate