Should add fade in/fade out effect when switching image

[dao-phuong]

Currently, It look pretty sharp and sudden when image src is changed. To make it more smoothly, we can add fade in fade out effect when switching image.

This is a solution I found: https://stackoverflow.com/questions/23583245/add-transition-while-changing-img-src-with-javascript

[AviKKi]

https://stackoverflow.com/a/23584060/9046268 This looks like a good solution we can inject extra img tag with JS while initializing.