for Windows users
which image size is appropriate for your screen.
the appropriate link to load the image onto a new browser
window thereby downloading it to your computer. This may
take a while depending on your connection speed.
it's displayed on the screen...
right click on the picture and select "Set as background"
right click on the picture, select "Save image as (rgxxx_xxx_xxx)"
and save to your windows folder. Then select the file using
the screen properties dialogue.
right click on the picture and select "Save image as
> desktop background"
other browsers/operating systems
Sorry, I don't know but the links link directly to the images
so you should be able to download them in a manner appropriate to