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.