jQuery set ancestor element for scope
<p>I have a situation where all my selectors all have the same ancestor element</p>

<pre><code>$('#foo .bar')...
$('#foo .some_class')...
$('#foo .some_other_class')...
</code></pre>

<p>I was wondering if there was a way to tell jQuery to always assume the selector will descend from <code>#foo</code>? So something like</p>

<pre><code>$.ancestorWillAlwaysBe('#foo');
$('.bar')...
$('.some_class')...
$('.some_other_class')...
</code></pre>
