When a certain value of a drop down is selected change a different drop down selection
<p>I need to check to see if the user selects a certain value in a drop down menu. If that value is selected I need it to change another drop down menu's selection.</p>

<p>Here is the html for the first drop down. If Quarterly is selected I need Quarterly to be selected in the 2nd drop down. If anything else is selected there will be no change.</p>

<pre><code>&lt;select id="frequency" name="frequency"&gt;
  &lt;option selected="selected" value=""&gt;Select One&lt;/option&gt;
  &lt;option value="Monthly"&gt;Monthly&lt;/option&gt;
  &lt;option value="Quarterly"&gt;Quarterly (1 Year Minimum, 4 deliveries)&lt;/option&gt;
&lt;/select&gt;


   &lt;select id="MonthPlan" name="MonthPlan"&gt;
      &lt;option selected="selected" value=""&gt;Select One&lt;/option&gt;
      &lt;option value="3Months"&gt;3 Months&lt;/option&gt;
      &lt;option value="6Months"&gt;6 Months&lt;/option&gt;
      &lt;option value="9Months"&gt;9 Months&lt;/option&gt;
      &lt;option value="12Months"&gt;12 Months&lt;/option&gt;
      &lt;option value="Quarterly"&gt;Quarterly (1 Year Minimum, 4 deliveries)&lt;/option&gt;
    &lt;/select&gt;
</code></pre>
