Simple Category Tree

[some name not taken]

The debug utility is telling me

[25-Oct-2008 23:46:12] PHP Parse error: syntax error, unexpected T_VARIABLE in /home/litez/public_html/includes/templates/template_default/sideboxes/tpl_my_categories.php on line 3

with the following (amended) code

<?php
$content = '';
$content .= $_SESSION['category_tree']->build_category_string('ul', 'li', '', 0, 2) $categories_id = 0 retrieve_categories_tree_array() build_deepest_level_children() 

retrieve_deepest_cats_array($categories_1, categories_2, categories_3);
?>