Step 1: Copy the code below & paste it on your product page in the big image(change the src of image with your product image source)
<img src="your image loccation" id="imageBox">
Step 2: Copy the code below & paste it on your product page in the small images (change the src of image with your product image source)
<img src="your image loccation" onclick="myFunction(this)">
Step 3: Copy the code below & paste it on your product page before the body tag end.
<!-- js for gallery image -->
<script>
function myFunction(smallImg)
{
var fullImg = document.getElementById("imageBox")
fullImg.src = smallImg.src;
}
</script>
