title: Pre-render images
body: <p>I have a div called <code>#highlights</code> which swaps article titles and illustrations. When I change to a new illustration using jQuery like this</p>
  
  <pre><code>$("#highlights").css("background","url("+path+")");
  </code></pre>
  
  <p>the background picture being set shows up slowly for the first time. How could I fix this?</p>