How do you override a module function which isnt named theme_foo_module_function

Hello, this might have an obvious answer, but it's alluding me...

I want to override a function of a contrib module in Drupal 6. The standard approach is to copy the function code into your template.php, make the changes and rename the function from theme_foo_module_function to mytheme_foo_module_function, but what do you do when the function you want to override isnt named theme_foo_module_function but just foo_module_function?

That is I want to override the dev version of Integrated Metatags' int_meta_show_tags() function, modifying this quick patch to instead handle Facebook's Open Graph properties.

e.g. to go from this:

function int_meta_show_tags($tag) {
	static $types = array();
	if (is_array($tag)) {
		// Cycle through each tag individually
		foreach ($tag as $curr) {
			int_meta_show_tags($curr);
		}
	} elseif ($tag->status) {
		if (!isset($types[$tag->type])) {
			$types[$tag->type] = int_meta_load_type($tag->type);
		}

		if (!empty($tag->values) || $types[$tag->type]->empty) {
			if (!is_array($tag->values)) {
				$tag->values = array($tag->values);
			}

      // If we shouldn't show empty tags, do a check here
      if (!$types[$tag->type]->empty && !strlen(trim(implode('', $tag->values)))) {
        return;
      }

      // Cleanup the data so we don't accidentally break anything
      $name = check_plain(strip_tags(!empty($tag->name) ? $tag->name : $tag->field));
      foreach ($tag->values as $key => $value) {
        $value = check_plain(preg_replace('/[\n\r]+/', ' ', strip_tags(trim($value))));

        if ($tag->combine) {
          $tag->values[$key] = $value;
        } else {
          $value = int_meta_trim($name, $value);
          drupal_set_html_head('<meta name="' . $name . '" content="' . $value . '" />');
        }
      }

      if ($tag->combine) {
        $value = int_meta_trim($name, implode(', ', array_unique($tag->values)));
        drupal_set_html_head('<meta name="' . $name . '" content="' . $value . '" />');
      }
		}

to this:

function int_meta_show_tags($tag) {
	static $types = array();
	if (is_array($tag)) {
		$nameAttribute = 'name';
		if (stripos($name, 'og:') === 0) {
			$nameAttribute = 'og';
			$name = substr($name, strlen('og:'));
		}
		// Cycle through each tag individually
		foreach ($tag as $curr) {
			int_meta_show_tags($curr);
		}
	} elseif ($tag->status) {
		if (!isset($types[$tag->type])) {
			$types[$tag->type] = int_meta_load_type($tag->type);
		}

		if (!empty($tag->values) || $types[$tag->type]->empty) {
			if (!is_array($tag->values)) {
				$tag->values = array($tag->values);
			}

      // If we shouldn't show empty tags, do a check here
      if (!$types[$tag->type]->empty && !strlen(trim(implode('', $tag->values)))) {
        return;
      }

      // Cleanup the data so we don't accidentally break anything
      $name = check_plain(strip_tags(!empty($tag->name) ? $tag->name : $tag->field));
      foreach ($tag->values as $key => $value) {
        $value = check_plain(preg_replace('/[\n\r]+/', ' ', strip_tags(trim($value))));

        if ($tag->combine) {
          $tag->values[$key] = $value;
        } else {
          $value = int_meta_trim($name, $value);
          drupal_set_html_head('<meta ' . $nameAttribute . '="' . $name . '" content="' . $value . '" />');
        }
      }

      if ($tag->combine) {
        $value = int_meta_trim($name, implode(', ', array_unique($tag->values)));
        drupal_set_html_head('<meta ' . $nameAttribute . '="' . $name . '" content="' . $value . '" />');
      }
		}
	}
}

I could just patch the module's files directly, but it would seem to be more sensible to somehow override it? Is the theme's template.php even the right place to do this, for instance should I create my own little module that overrides this function, if so could you please point me in the right direction on how to do so?

Thank you.