Could I edit the PHP in the tlp_header.php so that different links appear in the header if are logged in or logged out?

I copied and started to edit the ‘My account’ link as it only appears when you log in.
I changed this;

<li><a href="<?php echo zen_href_link(FILENAME_ACCOUNT, '', 'SSL'); ?>"><?php echo HEADER_TITLE_MY_ACCOUNT; ?></a></li>

<?php

} else {

if (STORE_STATUS == '0') {

?>


to this;

<li><a href="http://google.com">Google Logged In</a></li><?php

} else {

if (STORE_STATUS == '0') {

?>


But i just got a blank page as the PHP crashed. Could anyone help with this? Eventually I want a different EZ-Page to appear when you are logged in.