Need simple coding help for Shopping Cart in Header

[georgiepants]

...templates/CUSTOM/common/tpl_header.php

I started to add in some code below and labeled it as such,

<!--bof Shopping Cart Totals in Header Add-on-->
    <!--NOTE: this add-on was modified to correct an error in cart totals $$ (check forum post subsciptions for code details)-->
    <!--"//"Comment or Uncomment to use-->
  
      <span class="style1">
        <li><a href="<?php echo zen_href_link(FILENAME_SHOPPING_CART, '', 'NONSSL'); ?>">
            My Cart: <?php echo ($_SESSION['cart']->count_contents()); ?>

<!--BOF WHAT I ADDED, I'M PRETTY SURE ITS NOT RIGHT BUT MAYBE SOMEONE CAN HELP TO CLEAN IT UP-->

<?php if ($_SESSION['cart']->count_contents() !<1;
 echo ONE_ITEM_IN_CART;
{else}
echo MULTIPLE_ITEMS_IN_CART;?>
          <!--EOF WHAT I ADDED-->
</a>
          <?php $header_cart = $currencies->format($_SESSION['cart']->show_total());  echo $header_cart;?>
        </li>
      </span>
    <!--eof Shopping Cart Totals in Header Add-on-->

    <!--"//" comment or uncomment to hide/use this original code-->
<?php if ($_SESSION['cart']->count_contents() != 0) { ?>
    <!--keep tag info commented out if php is commented out otherwise it will cause an invisible link to the index next to the LogIn link in nav
    <li><a href="<?php //echo zen_href_link(FILENAME_SHOPPING_CART, '', 'NONSSL'); ?>"><?php //echo HEADER_TITLE_CART_CONTENTS; ?></a></li>-->
  <li><a href="<?php echo zen_href_link(FILENAME_CHECKOUT_SHIPPING, '', 'SSL'); ?>"><?php echo HEADER_TITLE_CHECKOUT; ?></a></li>

<?php }?>

Again, I'm not a programmer but I kind of get the idea of what I need, just not sure how to execute the code.

Any help is greatly appreciated!