Add Login & Logout links to Magento Top Links automatically

<?php if (! Mage::getSingleton('customer/session')->isLoggedIn()): ?>
<a href="<?php echo Mage::helper('customer')->getLoginUrl(); ?>"><?php echo $this->__('Login') ?></a>
<?php else: ?>
<a href="<?php echo Mage::helper('customer')->getLogoutUrl(); ?>"><?php echo $this->__('Logout') ?></a>
<?php endif; ?>