<head>
<script>
var index = 0;
function changeImage(BottleID, Image1, Image2) {
  alert(Image1);
  var imageList = [Image1, Image2];
  index = index + 1;
  if (index == imageList.length) {
     index = 0;
  }
  var image1 = document.getElementById(BottleID);
  image1.src = imageList[index];
}
</script>
</head>


<button onclick="changeImage('Bottle1923', 'http://wallpaper-gallery.net/images/image/image-13.jpg', 'https://3.bp.blogspot.com/-W__wiaHUjwI/Vt3Grd8df0I/AAAAAAAAA78/7xqUNj8ujtY/s1600/image02.png')">See Back</button>

<img id="Bottle1923" src="http://wallpaper-gallery.net/images/image/image-13.jpg" style="width:100px">