title: If Select tag option is selected shows another select tag
body: <p>I need code either in js or jquery or php like this. </p>
  
  <pre><code>&lt;select id="1"&gt;
  &lt;option value="1"&gt;....&lt;/option&gt;
  &lt;option value="2"&gt;....&lt;/option&gt;
  &lt;option value="3"&gt;....&lt;/option&gt; 
  &lt;/select&gt;
  </code></pre>
  
  <p>If option value 3 is selected, it should populate another select like</p>
  
  <pre><code>&lt;select id="2"&gt;
  -
  -
  &lt;/select&gt;
  </code></pre>
  
  <p>if not value 3 is selected nothing happens.</p>