Log in as the super admin as only a super admin can access the settings area - under the Settings menu select the second drop down menu "Catalog Display Layout Images"
At the bottom of the page you'll find the file upload field for the background image:
The Background image (see attached samples - 1 Solid Color & 1 Pattern) is a graphic file for the color or design you want to use as your catalogs background - this image will not show through the catalog pages as the display area of your catalog is set to a white background color -
THIS FILE MUST BE UNDER 100K in size.
Generally though the Background image file size need only be 50 pixel by 50 pixel (solid colors) which would result in a file size of only about 1 k or so. The reason the file size is limited to a maximum of 100 k is so it will not slow down the loading for your site on the screen.
Background image:
(this is what is shown onthe upload form)100k Max file size. File Types- Gif, Jpeg, BMP, PNG Only.
The Background Image will repeat from left to right & top to bottom.
Experiment to find the background image that looks good to you.
If no background image is used your background will be White
We have uploaded some sample background images you can use if you'd like they are located here :
http://webglobalnet.net/support/index.php/board,221.0.html