What does "a." mean in this snippet of Javascript?
<p>In the Javascript below, what does the <code>a.</code> before the <code>cell1</code> signify?</p>

<pre><code>&lt;script type='text/javascript'&gt;
$(function(){
    $("a.cell1").click(function(){
</code></pre>

<hr>

<p>EDIT:  Thanks for the answers.  Would it work if I did this to the Facebook Like button:</p>

<pre><code>&lt;fb:like href=""  class="cell1" send="true" layout="button_count" width="450" show_faces="false" font="arial"&gt;&lt;/fb:like&gt;
</code></pre>
