title: Add an external input value to form on submit
body: <p>I have a typical form:</p>
  
  <pre><code>&lt;form action="" accept-charset="utf-8" method="post"&gt;
      &lt;textarea name="content"&gt;&lt;/textarea&gt;
  &lt;/form&gt;
  </code></pre>
  
  <p>and an not-inside-a-form element:</p>
  
  <pre><code>&lt;input type="password" name="password"&gt;
  </code></pre>
  
  <p>How do I add the value of password into the form when I submit the form?</p>
  
  <pre><code>$('form').submit(function(){
     //hmmm
  });
  </code></pre>