title: Page display different wallpaper depending on which of two sites linked from
body: <p>I have two pages, both of which include a php includes link to a third page. </p>
  
  <p>At the moment I have two versions of this third page, both with different background to suit where on the page they need to be. Rather than maintaining two mostly identical pages, is there anyway of having one, BUT can tell which of the two links called it, and subsequently display different background. </p>
  
  <p>I know a solution would be based on the original two pages, but for complicated reasons, it really has to be based on the third php file. </p>
  
  <p>Thanks </p>