Viewport Height Background Slider
The slideshow on this page is a much better option than the previous one for responsive websites. Rather than have to stretch to fill the browser background, the image is set to fill the viewport width and height.
The slider is fixed in position and given a negative z-index so that the page content scrolls over it.
It also has the advantage of being able to insert a smaller image file for mobile devices and has an option to lazy load the images.