There are two methods. The second method will only work if your ISP will set up sub folders for you to publish your web site to. Thanks to Robert Haviland for providing the second method. See Robert's "The Pages of Publisher Pages".
i) Publish your web site to a folder.
ii) Preview the page you want to edit the background on in your browser (e.g. page8)
iii) Go to View/Source on your browser.
iv) Find "back.gif" in your HTML document and change it to reference the background file (e.g. brick.gif). Save the change.
v) Add the background file to the folder.
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