title: jQuery Validate checkbox checked required?
body: <p>I'm using jQuery Validation plugin to validate a form.</p>
  
  <p>The problem is that I can't find a way to validate if a single checkbox in my form  is checked </p>
  
  <p>HTML markup:</p>
  
  <pre><code>&lt;label for="terms"&gt;terms : &lt;/label&gt;
  &lt;input type="checkbox" name="terms" id="terms"&gt;
  </code></pre>
  
  <p>jQuery code:</p>
  
  <pre><code>rules: {
      terms: "required"
  },
  messages:{
      terms: "check the checbox"
  }
  </code></pre>
  
  <p>Any help would be appreciated.</p>