title: jQuery form input select by id
body: <h2>Code</h2>
  <pre><code>&lt;form id='a'&gt;
    &lt;input id='b' value='dave'&gt;
  &lt;/form&gt;
  </code></pre>
  <h2>Question</h2>
  <p>How do I get the value from input 'b' while at the same time make sure it is inside 'a' (something like <code>$('#a:input[id=b]')</code>).</p>
  <p>I only ask because I might have other inputs called 'b' somewhere else in my page and I want to make sure I'm getting the value from the correct form.</p>