Help needed for PageFlipLayout to work with my jpg images

[NadaThiru]

Hi,
I am new to GitHub.
Downloaded https://github.com/codrops/PageFlipLayout and it works with the images that came with the code. But it does not work with my own images. I replaced the original images with my own and opened index.html. My images did not show up.
Can any one help me?
Thank you.