I don't have a sidebar background image on any page, just on the post page, which in this case will be serving as the website's Home page. (What you see at the top and bottom is part of the header & footer graphics.)

The URL is http://wildwildwesthomes.com.

I only have the Right sidebar enabled, not the right inner sidebar, and I have it checked to display on all pages. I don't have it disabled on any pages.

This is the code I have in the Right Sidebar Style area:

padding: 10px 10px 10px 10px;
background: url(wp-content/themes/atahualpa/images/sidebar.jpg) repeat-y;

Any ideas? Thanks!

Either put a slash at the beginning of the image path or use the full path. And I would add quotes around the path as well.

background: url("/wp-content/themes/atahualpa/images/sidebar.jpg") repeat-y;

OR

background: url("http://wildwildwesthomes.com/wp-content/themes/atahualpa/images/sidebar.jpg") repeat-y;