title: How to set background size (height & width)?
body: <p>I'm very new to JavaScript.</p>
  
  <p>My code so far: </p>
  
  <pre><code>$("#Stage").css(
    "background-image",
    "url(BG.jpg)",
    "background-attachment", 
    "fixed"
  );
  </code></pre>
  
  <p>What I want to do is have the background image at a set size so lets say: <code>width: 100%</code> and <code>height: 100%</code>.</p>