How do I fix this jquery code that sends a dropdown value to a text field?
<p>I thought I had this figured out, but can't get it working correctly:</p>

<p><strong>All I want is the following</strong>:
onChange of either of these dropdowns take the selected value and add it to the hiddentext field <em>[in the actual app, these dropdowns are in a fieldset and only one or the other is displayed based on product type selected]</em>  Simple I know, but I can't see what I am doing wrong.</p>

<p><strong>Code below and my jsFiddle is here</strong>: <a href="http://jsfiddle.net/justmelat/M3hyX/" rel="nofollow">http://jsfiddle.net/justmelat/M3hyX/</a></p>

<pre><code>&lt;form method="post" action=""&gt;
&lt;fieldset name="projInfo" id="projInfo"&gt;
                &lt;legend&gt;Proj Info&lt;/legend&gt;
                Hidden Product Field:  &lt;input name="hiddenProdField" id="hiddenProdField" type="text" /&gt;
                            &lt;/fieldset&gt;

&lt;fieldset name="Group1" id="Group1"&gt;
                &lt;legend&gt;Product 1&lt;/legend&gt;
                &lt;select name="firstSet"  id="firstSet"&gt;
                &lt;option value="0"&gt;Select&lt;/option&gt;
                &lt;option value="One"&gt;One&lt;/option&gt;
                &lt;option value="Two"&gt;Two&lt;/option&gt;
                &lt;option value="Three"&gt;Three&lt;/option&gt;
            &lt;/select&gt;
            &lt;/fieldset&gt;
&lt;fieldset name="Group2" id="Group2"&gt;
                &lt;legend&gt;Product 2&lt;/legend&gt;
                &lt;select name="secondSet"  id="secondSet"&gt;
                &lt;option value="0"&gt;Select&lt;/option&gt;
                &lt;option value="Four"&gt;Four&lt;/option&gt;
                &lt;option value="Five"&gt;Five&lt;/option&gt;
                &lt;option value="Six"&gt;Six&lt;/option&gt;
            &lt;/select&gt;
            &lt;/fieldset&gt;
&lt;fieldset name="Group3" id="Group3"&gt;
                &lt;legend&gt;Product 3&lt;/legend&gt;
                &lt;select name="thirdSet"  id="thirdSet"&gt;
                &lt;option value="0"&gt;Select&lt;/option&gt;
                &lt;option value="Seven"&gt;Seven&lt;/option&gt;
                &lt;option value="Eight"&gt;Eight&lt;/option&gt;
                &lt;option value="Nine"&gt;Nine&lt;/option&gt;
            &lt;/select&gt;
            &lt;/fieldset&gt;
&lt;/form&gt;​

$(document).ready(function() {
        $("select#firstSet, select#secondSet, select#thirdSet").change(function(){
            var prodType = "";
            $("select#firstSet, select#secondSet, select#thirdSet option:selected");
            prodType = $(this).text();
          $("#hiddenProdField").text(prodType);
        })
        .trigger('change');
    });
</code></pre>
