title: How to change the background image when using the Unity Facebook SDK
body: <p>I'm using the Unity Facebook SDK to set up my Unity game in Facebook.</p>
  
  <p>I've setup the app using 'Unity integration enabled' and the game works as desired.</p>
  
  <p>I would like to change the background image of the webpage from plain white to a bitmap image.</p>
  
  <p>I would normally edit the HTML to do this but I don't have access to it through the SDK.</p>
  
  <p>I've tried using Application.ExternalEval to inject some Javascript into the HTML page similar to this:</p>
  
  <pre><code>var content = document.getElementById("pagelet_canvas_content");
  content.style.backgroundImage = "url('background.jpg')";
  </code></pre>
  
  <p>But I can't access any of the elements that the Chrome debugger is telling me are there.</p>
  
  <p>Does anyone know how to personalise the Facebook page?</p>