Adding stuff.

[gjh42]

Content you want to appear outside the borders of the page, for all pages, should be added to /includes/templates/your_template/common/tpl_main_page.php (copy it from /template_default/common/). You would probably add it after the opening <body...> tag and before the mainWrapper div.

If you just want some images that will not change for the outer edges, making background images controlled by the stylesheet would be the easiest and best way to go.

If as appears you are using the Classic template, your first act should be to create or install a custom template and modify from there. See the customizing tutorials in the FAQ button at the top of this page. The classic template should stay as is to serve as a debug tool if you ever need to figure out some layout or function issue.