Drupal 6.x

Upgrading a very simple node-type module from Drupal 5.x to 6.x
Having an issue with the taxonomy_autocomplete not working for the title of the node.
The "logo" node-type title = any website url, and has a related taxonomy vocab, titled "Site".
This module makes the node title field autocomplete with terms from this "Site" vocabulary.
http://i.imgur.com/NWkOr6u.jpg
Currently getting the following error:

An error occurred.
http://*sitename*/logo/autocomplete/3

Fatal error: Call to undefined function taxonomy_autocomplete() in /sites/all/modules/logos/logo.module on line 194

Line 194:
return taxonomy_autocomplete($vid, $text);
Complete function:

function _logo_filter_site_list($text) {
  return strtolower(str_replace(array('http://', 'www.'), '', $text));
}
function logo_autocomplete($vid, $text) {
  $text = _logo_filter_site_list($text);
  return taxonomy_autocomplete($vid, $text);
}

Relevant parts of the module code:

function logo_node_info() {
return array(
'logo' => array(
'name' => t('Logo'),
'module' => 'logo',
'description' => t('Logo for a site.'),
'has_title' => TRUE,
'title_label' => t('Site'),
'body_label' => t('Description')
)
);
}

/**
* Implementation of hook_menu().

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Hello,

Do you add taxonomy keywords to your websites or shops ?

Imagine that you sell Tshirts.

A Black Nike Tshirt can be seen on taxonomy words BLACK TSHIRT and NIKE TSHIRTS, but is it bad for SEO ?

Should we just avoid to type any taxonomy keywords or is there a way not to make them clickable ?

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I need to create a personal itinerary. It has to be valid for anonymous users. I have a list of sesions with authors in differents days. I can search by days, authors, title. When the application finds the results, users can add in their own schedule. And then they can print it. It's like a tv guide where you select the program you want.

Is there any module similar?
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Thanks in advance

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If you know how I can achieve this please let me know.

Thank you.