I hope I'm not posting something obvious here. I did have a good look but I couldn't find an answer to my question. Here it is:
I've designing a site and it has a repeated background. I need to add an extra design element to the background of the site, a tree in fact, but I can't just edit it into the background image as it's repeating.
What I need to do is have this tree appear on the right hand side of the background, behind the page content, but I'm not entirely sure how to accomplish this. I'm guessing some kind of div with a z-index to put it in the right place, but I'm not sure.
Any information would be super. I'm using the Twenty Ten theme.