How to make breadcrumb appear?

[mobile-advice]

I've noticed that my breadcrumb trail is missing. What is the easiest way to get it to show?

[jonquil]

includes/header.php:

 

?>
<table border="0" width="100%" cellspacing="0" cellpadding="0">
 <tr class="header">
   <td valign="middle"><?php echo '<a href="' . tep_href_link(FILENAME_DEFAULT) . '">' . tep_image(DIR_WS_IMAGES . 'oscommerce.gif', 'osCommerce') . '</a>'; ?></td>
   <td align="right" valign="bottom"><?php echo '<a href="' . tep_href_link(FILENAME_ACCOUNT, '', 'SSL') . '">' . tep_image(DIR_WS_IMAGES . 'header_account.gif', HEADER_TITLE_MY_ACCOUNT) . '</a>  <a href="' . tep_href_link(FILENAME_SHOPPING_CART) . '">' . tep_image(DIR_WS_IMAGES . 'header_cart.gif', HEADER_TITLE_CART_CONTENTS) . '</a>  <a href="' . tep_href_link(FILENAME_CHECKOUT_SHIPPING, '', 'SSL') . '">' . tep_image(DIR_WS_IMAGES . 'header_checkout.gif', HEADER_TITLE_CHECKOUT) . '</a>'; ?>  </td>
 </tr>
</table>
<table border="0" width="100%" cellspacing="0" cellpadding="1">
 <tr class="headerNavigation">
   <td class="headerNavigation">  [b][color="#FF0000"]<?php echo $breadcrumb->trail(' » '); ?>[/color][/b]</td>
   <td align="right" class="headerNavigation"><?php if (tep_session_is_registered('customer_id')) { ?><a href="<?php echo tep_href_link(FILENAME_LOGOFF, '', 'SSL'); ?>" class="headerNavigation"><?php echo HEADER_TITLE_LOGOFF; ?></a>  |  <?php } ?><a href="<?php echo tep_href_link(FILENAME_ACCOUNT, '', 'SSL'); ?>" class="headerNavigation"><?php echo HEADER_TITLE_MY_ACCOUNT; ?></a>  |  <a href="<?php echo tep_href_link(FILENAME_SHOPPING_CART); ?>" class="headerNavigation"><?php echo HEADER_TITLE_CART_CONTENTS; ?></a>  |  <a href="<?php echo tep_href_link(FILENAME_CHECKOUT_SHIPPING, '', 'SSL'); ?>" class="headerNavigation"><?php echo HEADER_TITLE_CHECKOUT; ?></a>   </td>
 </tr>
</table>
<?php

jon