only input check boxes that are checked in the first td in a tr
<p>How do I get the the number of matches/length of: only input check boxes that are checked in the  first td in a tr?</p>

<p>this works:</p>

<pre><code>$('#myTable').find('tr td input[type=checkbox]:checked').parents('tr').length;
</code></pre>

<p>this wont work</p>

<pre><code>$('#myTable').find('tr td:eq(0) input[type=checkbox]:checked').parents('tr').length;
</code></pre>
