var imgList = [];

function createImgList() {
	// create an array of images to apply the border effect
	var imgs = document.body.getElementsByTagName("img");
	for (var i=0; i < imgs.length; i++) {
		if (imgs[i].className == "border0") {
			imgList.push(imgs[i]);
		}
	}
	borderchange(1);
}

function borderchange(n) {
	for (var i=0; i < imgList.length; i++) {
		imgList[i].className = "border" + n;
	}
	setTimeout(function () {borderchange(Math.abs(n-1));},1000);
}

window.onload = createImgList;