jquery addClass to all labels
<p>I have </p>

<pre><code>&lt;div id="brand_name"&gt;
Audi
&lt;span class="select_all"&gt;
Select all
&lt;/span&gt;
&lt;/div&gt;&lt;div class="models"&gt;
&lt;label for="search_model_id_in_61"&gt;&lt;input id="search_model_id_in_61" name="search[model_id_in][]" type="checkbox" value="61"&gt;100&lt;/label&gt;
&lt;label for="search_model_id_in_62"&gt;&lt;input id="search_model_id_in_62" name="search[model_id_in][]" type="checkbox" value="62"&gt;80&lt;/label&gt;
&lt;/div&gt;
</code></pre>

<p>I try to write like:</p>

<pre><code>$(".select_all").click() {
   var models = $(this).parent().next()
}
</code></pre>

<p>but how to addClass class="checked" to all labels</p>
