Make selected by value
<pre><code>&lt;select id="selectBox"&gt;
  &lt;option value="2"&gt; two &lt;/option&gt;
  &lt;option value="4"&gt; four&lt;/option&gt;
  &lt;option value="6"&gt; six &lt;/option&gt;
&lt;/select&gt;
</code></pre>

<p>I have value 4, Now how to make <code>selectBox</code> selected with value 4 with javascript?</p>
