Determine if value is already selected in another select field
<p>All,
I have the following select box:</p>

<pre><code>&lt;select class="event_selection" name="Event[]" id="Event_&lt;?php echo $i; ?&gt;" &gt; 
    &lt;option value="original"&gt;Select Event...&lt;/option&gt; 
    &lt;option value="1"&gt;One&lt;/option&gt; 
    &lt;option value="2"&gt;Two&lt;/option&gt;
&lt;/select&gt;
</code></pre>

<p>I have a couple of these on my form. When a user selects a value from the drop down I'd like to make sure that the value isn't already selected on another select that has the same class.</p>

<p>Is there an easy way to do this? If so, can you please point me in the right direction?</p>

<p>Thanks!</p>
