jQuery: finding previous div
<pre><code>&lt;div class="a" style="display:none"&gt;Content 1&lt;/div&gt;
&lt;div class="a" style="display:none"&gt;Content 2&lt;/div&gt;

some other HTML...

&lt;span id="b"&gt;foobar&lt;/span&gt;
</code></pre>

<p>How can I match the first div class="a" above the span id="b" to show() it? The id="b" is the only thing I know before. </p>
