How to selectively enable a Dropdown List
<p>I have a form containing two DropDowns lists:</p>

<ol>
<li>Marital Status</li>
<li>No. of Children</li>
</ol>

<p>Now I would like to enable the No. of Children DropDown upon selection of following items in the Marital Status DropDown:</p>

<ol>
<li>Widow</li>
<li>Divorced</li>
<li>Awaiting Divorce</li>
</ol>

<p>How can I do it?</p>
