title: Avoid duplication of form input element ID in Django
body: <p>When two forms on one page have the same-named field, Django will generate invalid HTML:</p>
  
  <pre><code>&lt;!--one form --&gt;
  &lt;input id="id_name"..../&gt;
  ...
  &lt;!--another form--&gt;
  &lt;input id="id_name".../&gt;
  </code></pre>
  
  <p>Invalid because two or more nodes share the same id.</p>
  
  <p>How can this be avoided?</p>
  
  <p>Thanks.</p>