make append happen only the first time
<p>i have on a list a button that fire this event:</p>

<p><strong>js:</strong></p>

<pre><code>$(this).parents('tr')
       .find('.class')
       .append("&lt;input type='text' size='5'/&gt;");
</code></pre>

<p>its possible to make this append happen just in the first time? </p>

<p>like a <code>return false</code>, dont know.</p>

<p>Thanks!</p>
