Snippet from here: http://drupal.org/node/115419
<?php
// Only show if $match is true
$match = false;
// Which node types
$types = array('event', 'anothernodetype' );
// Match current node type with array of types
if (arg(0) == 'node' && is_numeric(arg(1))) {
$nid = arg(1);
$node = node_load(array('nid' => $nid));
$type = $node->type;
$match |= in_array($type, $types);
}
return $match;
?>!!!!!
Might have better luck with the below, to avoid possible complicated problems that falsely appear to come from ACL
http://www.feike.biz/weblog/2008/01/07/drupal-using-node-and-user-inform...
if (arg(0) == 'node' && is_numeric(arg(1)) && (arg(2) == '' || arg(2) == 'view')){