Jquery form validation making password fields require if any one is having any value
<p>I have two password fields </p>

<p>pwd1 and pwd2 </p>

<p>I am using jquery plugin <a href="http://bassistance.de/jquery-plugins/jquery-plugin-validation/" rel="nofollow">http://bassistance.de/jquery-plugins/jquery-plugin-validation/</a></p>

<p>How to make pwd1 and pwd2 to be required and equal if and only if any one of the field is non-empty ?</p>
