jquery form input select by id
<p>This is very very simple but strangely absent from the web (hummm...)</p>

<pre><code>&lt;form id='a'&gt;
  &lt;input id='b' value='dave'&gt;
&lt;/form&gt;
</code></pre>

<p>How do I get the value from input 'b' while at the sametime make sure it's inside 'a' (something like <code>$('#a:input[id=b]')</code>).</p>

<p>I only ask because I might have other input's called 'b' somewhere else in my page and I want to make sure I'm getting the value from the right form</p>
