Wanted to post some corrections/updates.. Just in case someone else was looking for this information like I was..:D I just wanted to pay it forward by posting what worked for me..
I added a title attribute to my header.php entries so that when you hover the image links see a text tooltip.
define('HEADER_TITLE_LOGIN', '<img src="images/menu_icons/icon_login.jpg" alt="Log In" title=" Log In " />');
```I also forgot that the "Home" link in the footer links is driven by the header.php language file. So to avoid my "Home" icon from appearing in my footer links as well, I added another definition to my header.php as follows (highlighted in red):
// header text in includes/header.php
define('HEADER_TITLE_CREATE_ACCOUNT', 'Create Account');
define('HEADER_TITLE_MY_ACCOUNT', '<img src="images/menu_icons/icon_account.jpg" alt="My Account" title=" My Account " />');
define('HEADER_TITLE_CART_CONTENTS', '<img src="images/menu_icons/icon_cart.jpg" alt="Shopping Cart" title=" Shopping Cart " />');
define('HEADER_TITLE_CHECKOUT', '<img src="images/menu_icons/icon_checkout.jpg" alt="Checkout" title=" Checkout " />');
define('HEADER_TITLE_TOP', 'Top');
define('HEADER_TITLE_CATALOG', '<img src="images/menu_icons/icon_home.jpg" alt="Home" title=" Home " />');
define('HEADER_TITLE_LOGOFF', '<img src="images/menu_icons/icon_logout.jpg" alt="Log Out" title=" Log Out " />');
define('HEADER_TITLE_LOGIN', '<img src="images/menu_icons/icon_login.jpg" alt="Log In" title=" Log In " />');
define('HEADER_TITLE_CATALOG_FOOTER', 'Home');
<li><?php echo '<a href="' . HTTP_SERVER . DIR_WS_CATALOG . '">'; ?><?php echo
HEADER_TITLE_CATALOG_FOOTER; ?></a></li>
```Now it all works nicely!
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