Try changing this code in your tpl_header.php file
Locate the <!--bof-navigation display-->
and
<!--eof-navigation display-->
Change only the code between those parts
Code:
<!--bof-navigation display-->
<div id="navMainWrapper">
<div id="navMain">
<ul class="back">
<li><?php echo '<a href="' . HTTP_SERVER . DIR_WS_CATALOG . '">'; ?><span><?php echo HEADER_TITLE_CATALOG; ?></span></a></li>
<?php if ($_SESSION['customer_id']) { ?>
<li><a href="<?php echo zen_href_link(FILENAME_LOGOFF, '', 'SSL'); ?>"><span><?php echo HEADER_TITLE_LOGOFF; ?></span></a></li>
<li><a href="<?php echo zen_href_link(FILENAME_ACCOUNT, '', 'SSL'); ?>"><span><?php echo HEADER_TITLE_MY_ACCOUNT; ?></span></a></li>
<?php
} else {
if (STORE_STATUS == '0') {
?>
<li><a href="<?php echo zen_href_link(FILENAME_LOGIN, '', 'SSL'); ?>"><span><?php echo HEADER_TITLE_LOGIN; ?></span></a></li>
<li><a href="<?php echo zen_href_link(FILENAME_ACCOUNT, '', 'SSL'); ?>"><span><?php echo HEADER_TITLE_MY_ACCOUNT; ?></span></a></li>
<?php } } ?>
<li><a href="<?php echo zen_href_link(FILENAME_SHOPPING_CART, '', 'NONSSL'); ?>"><span><?php echo HEADER_TITLE_CART_CONTENTS; ?></span></a></li>
<li><a href="<?php echo zen_href_link(FILENAME_CHECKOUT_SHIPPING, '', 'SSL'); ?>"><span class="last"><?php echo HEADER_TITLE_CHECKOUT; ?></span></a></li>
</ul>
</div>
<div id="navMainSearch"><?php require(DIR_WS_MODULES . 'sideboxes/search_header.php'); ?></div>
<br class="clearBoth" />
</div>
<!--eof-navigation display-->