title: HTML Attribute rel Errors using fancyBox
body: <p>I'm using fancyBox to create a gallery with the following code:</p>
  
  <pre><code>&lt;a class="fancybox" rel="group1" href="img/work/1.jpg"&gt;&lt;/a&gt;
  &lt;a class="fancybox" rel="group1" href="img/work/2.jpg"&gt;&lt;/a&gt;
  &lt;a class="fancybox" rel="group1" href="img/work/3.jpg"&gt;&lt;img src="img/th/thumb.jpg" alt="Thumb" /&gt;&lt;/a&gt;
  </code></pre>
  
  <p>But I'm getting errors while validating the code. It says:</p>
  
  <pre><code>Bad value group1 for attribute rel on element a: Keyword group1 is not registered.
  </code></pre>
  
  <p>How do I fix this issue? Am I not writing the code out correctly? I basically wanted one thumbnail, with 3 photos to scroll through.</p>
  
  <p>Thank you.</p>