The slider with a moving background is inserted into the slide of the top layer image with holes.
Images
We need 3 images: the top layer image with holes, and 2 background images.



Inner slider with a background
It is a simple Standard slider.

It consists of two slides.

Each slide is just a picture.

Slide with the top layer image.
It is a HTML slide in the main Standard slider.

Slide type is HTML

The HTML code of the slide
CSS-styles. The "hole layer" (.slide_over) has absolute positioning and image background.