After trying to remove the banner from Joomla again, I must declare defeat. The little flower picture is starting to grow on me like a fungus. I guess it will stay as all attempts to change it out with an image of a bookshelf have resulted in errors message and/or a site with  overlapping images which was quite frightening. It looks okay, just not my normal level of neurotic perfection.

Hope everyone else has had a better time!