Conditional to display only if customer is logged in
https://stackoverflow.com/questions/21110345/how-to-add-logout-link-in-topmenu-in-header-section
<?php
if( Mage::getSingleton('customer/session')->isLoggedIn()) { ?>
//not logged in
}
else{
// logged in
}
=============================================
<?php if (Mage::helper('customer')->isLoggedIn() ): ?>
<a href="<?php echo Mage::helper('customer')->getLogoutUrl(); ?>"><?php echo 'Log OUT'; ?></a>
<?php/*
else: ?>
<a href="<?php echo Mage::helper('customer')->getLoginUrl(); ?>">SIGN IN</a>
<?php
*/ ?>
<?php endif; ?>