WordPress: print link to next page

gistfile1.php

<?php
$allPages = get_pages(array(
  'sort_column' => 'menu_order',
  'sort_order' => 'asc',
));
for ($i=0; $i<count($allPages); $i++) // advance iterator to current page
  if ($allPages[$i]->ID == $post->ID)
    break;
$nextURI = $i<count($allPages)-1 ? get_permalink($allPages[$i+1]->ID) : "";
$nextTitle = strlen($nextURI)>0 ? $allPages[$i+1]->post_title : "";
?>
<a href="<?php print $nextURI; ?>"><?php print $nextTitle; ?></a>