title: how to propagate second drop down menu according to first one?
body: <p>my code is look like. I have created two pull down menu and i have to drag second values of second dropdown according to first value.</p>
  
  <pre><code>&lt;div&gt;
          &lt;label for="program"&gt;Program&lt;/label&gt;
          &lt;select id="trigger" name="program" class="x-large"&gt;
  
  
  
              &lt;option value="1"&gt;as&lt;/option&gt;
              &lt;option value="2"&gt;gs&lt;/option&gt;
  
  
                   &lt;/select&gt;
      &lt;/div&gt;
  &lt;div&gt;
          &lt;label for="issuer"&gt;Award Issuer&lt;/label&gt;
          &lt;select id="issuer" name="issuer"&gt;
              &lt;option value="1" class="issuer_1"&gt;s&lt;/option&gt;
  
  
              &lt;option value="1" class="issuer_1"&gt;st&lt;/option&gt;
          &lt;option value="2" class="issuer_2"&gt;skk&lt;/option&gt;
  
  
          &lt;/select&gt;
      &lt;/div&gt;
  </code></pre>