wp_list_pages – Active state

Hi,

I have a list of child page generated with…

<?php
if($post->post_parent)
$children = wp_list_pages(“title_li=&child_of=”.$post->post_parent.”&echo=0″);
else
$children = wp_list_pages(“title_li=&child_of=”.$post->ID.”&echo=0″);
if ($children) { ?>

<?php echo $children; ?>

<?php } ?>

Can anyone suggest how to assign a Active state to these links, example: like active state of menu items.

Warm Regards

Dipankar