title: PNG background image in Firefox 3.5.4
body: <p>Snippet of my CSS:</p>
  
  <pre><code>#wrapper div.box {
      background: url('box-bg.png') left top repeat-y;
  }
  #wrapper div.box h2 {
      background: url('box-top.png') left top no-repeat;
  }
  </code></pre>
  
  <p>That doesn't work. Instead of a transparent image it displays the image but with white space in place of transparent background.</p>
  
  <p>If I do:</p>
  
  <pre><code>&lt;img src="box-top.png" alt="" /&gt;
  </code></pre>
  
  <p>The transparent image shows up correctly. What's casuing this problem?</p>