title: Dynamic website background change from another site
body: <p>sorry if the title isn't overly clear but i don't know how else to word it.</p>
  
  <p>I have two websites and I will be looking after another one while the other wont be touched after it is released. What I want to do is get the sites background to change when the other site's background that I will be maintaining changes.</p>
  
  <p>Is this possible? </p>
  
  <p>Thanks</p>