<?php
// Drupal 5
// Show block if a node has a specific taxonomy term

$show_block = FALSE;
if ( arg(0) == "node" && is_numeric(arg(1)) ) {
   $node = node_load(arg(1));
   $section_term_id = 1334; // replace this to the corresponding term id
   $show_block = ( is_array($node->taxonomy) && in_array($section_term_id, array_keys($node->taxonomy))  );
 }
return $show_block;
?>