Then your PHP in the OP is what you want to put in. The version in post 12 will do the job.
PHP Code:
<?php
// categories_description
if ($current_categories_description != '') {
$php_content = '';//build content to be substituted for PHP_SUB in description
if ($featured_products->RecordCount() > 0) {
for ($i = 0; $i < $featured_products->RecordCount(); $i++) {
$php_content .= '<div class="categoryListBoxContents" style="width:33%;">';
$php_content .= '<a href="' . zen_href_link(FILENAME_DEFAULT, 'main_page=product_info&products_id=' . $featured_products->fields['products_id']) . '">';
$php_content .= zen_get_products_image($featured_products->fields['products_id']);
$php_content .= '</a></div>';
}
}
$current_categories_description = str_replace('PHP_SUB', $php_content, $current_categories_description);
?>
<div id="categoryDescription" class="catDescContent"><?php echo $current_categories_description; ?></div>
<?php } // categories_description ?>