how to collect form ids using jQuery
<p>A jQuery selector <code>$(".thumb_up")</code> returns a collection of forms like this:</p>

<pre><code>[&lt;form id="like_post_78" ...&lt;/form&gt; &lt;form id="like_post_79"&gt; ... &lt;/form&gt;]
</code></pre>

<p>Ultimately I want to generate a string consisting of the numerical ending portion of the form ids.</p>

<pre><code>"78,79"
</code></pre>

<p>What's the most efficient way of getting this?</p>
