That is easily done within RSD without having to make any custom CSS changes. Here is how:
1. First add your image by clicking the Resource Toolbar Icon.
....
That is it. Easy as 1-2-3.
So is it the 'best practice' to collect all the images you want to use and place them in the 'Resource' folder before you start? To keep in nice and tidy?
Inger, Norway
My work in progress:
Components for Site Designer and the HTML Editor: https://mock-up.coffeecup.com