title: nth-child() doesn't work
body: <p>I have one question about <code>nth-child()</code> and <code>nth-of-type()</code>, I have tried both variants, but neither works. Here is my code:</p>
  
  <pre><code>#commentdamcherirounded:nth-child(odd) {
      border-radius:4px;
      -moz-border-radius:4px;
      -o-border-radius:4px;
      -webkit-border-radius:4px;
      -khtml-border-radius:4px;
      width:680px;
      display:block;
      margin-bottom:15px;
      position:relative;
      margin-top:-16px;
      background-repeat:repeat-y;
      background-color:red;
  }
  #commentdamcherirounded:nth-child(even) {
      border-radius:4px;
      -moz-border-radius:4px;
      -o-border-radius:4px;
      -webkit-border-radius:4px;
      -khtml-border-radius:4px;
      width:680px;
      display:block;
      margin-bottom:15px;
      position:relative;
      margin-top:-16px;
      background-repeat:repeat-y;
      background-color:yellow !important;
  }
  </code></pre>