QUESTION How to Convert Component to a Function?

[Boneye]

I'm rather new to PHP and not sure how to do the following:

I want to include some code in my themes "functions.php" rather than add it as a component in GS. This code currently enables Zurb Foundation's "top bar" multi-level drop downs to work with GS.

Im not sure how to convert or whether its even possible to convert the code into a function that can be called in my themes template to render the menu correctly?

Currently the code below is is included in a component named "nav":

PHP Code:

<?php

$s = array('current', 'activepath', 'currentpath', 'open');
$r = array('active', 'active', 'active', 'has-dropdown');
$c = str_replace($s, $r, $item->classes);
?>
  <li class="<?php echo $c; ?>"><?php if ($item->isOpen) { ?><a href="<?php echo htmlspecialchars($item->link); ?>"><?php echo htmlspecialchars($item->text); ?></a>
      <ul class="dropdown">
      <?php $item->outputChildren(); ?>
      </ul><?php } else { ?>
<a href="<?php echo htmlspecialchars($item->link); ?>"><?php echo htmlspecialchars($item->text); ?></a><?php } ?></li><?php echo "\n"; ?>

and this component is then called in my template using:

PHP Code:

<?php get_i18n_navigation(get_page_slug(FALSE),0,2,I18N_SHOW_MENU, 'nav'); ?>

Can anybody guide me on whether this is possible, and how to do it correctly?

Thanks in advance

Boneye