Different page templates depending on node type

This didn't work for me (from template.php):

function _phptemplate_variables($hook, $vars) {
switch ($hook) {
case 'page':
// Add page template suggestions based on node type, if we aren't editing the node.
if ($vars['node'] && arg(2) != 'edit') {
$vars['template_files'][] = 'page-nodetype-'. $vars['node']->type;
}
break;
}
return $vars;
}

This did:

function phptemplate_preprocess_page(&$variables) {
// IF THIS IS NOT WORKING BE SURE TO CLEAR THE THEME REGISTRY.
// FAILURE TO DO SO WILL NOT ALLOW THIS FUNCTION TO BE CALLED.
if($node = menu_get_object()) {
$variables['node'] = $node;
$suggestions = array();
$template_filename = 'page';
$template_filename = $template_filename . '-' . $variables['node']->type;
$suggestions[] = $template_filename;
$variables['template_files'] = $suggestions;
}
}