My Index and Pages use kubrickbg-ltr.jpg as the background, which is what I want, but for some reason Posts use kubrickbgwide.jpg instead. (I’ve modified kubrickbg-ltr.jpg so it’s different from kubrickbgwide.jpg. And I’ve added a sidebar to single.php, so that’s why I want kubrickbg-ltr.jpg to be used and not kubrickbgwide.jpg.)