I got to this and itís bringing up the getName but the getUrl() isnít returning any URL at all....

Code:
<?php
$children = Mage::getModel('catalog/category')->getCategories(3);
foreach ($children as $category):
            echo '<li><a href="' . $category->getUrl() . '">' . $category->getName() . '</a></li>';
        endforeach;
?>
The output code is just
Code:
<li><a href="">name of sub-cat</a></li>
Anybody have any ideas Please? I have been trying to figure this out for over 5 hours to no avail

Thanks in advance!
Kayla