title: Opacity problem in MSIE
body: <p>This works in FF, Chrome and other browsers except IE8:</p>
  
  <pre><code>&lt;span class="cart_warning"&gt;Please select a color&lt;/span&gt;
  &lt;script type="text/javascript"&gt;
      $('.cart_warning').css({opacity: 0, color: '000000'});
  &lt;/script&gt;
  </code></pre>
  
  <p>In IE8 the color changes to black but opacity doesn't. What could be the problem? There are no transparent PNGs involved.</p>