Returns the page number for a comment.
Finds the correct page number for a comment taking into account display and paging settings.
$cid: The comment ID.
$node_type: The node type the comment is attached to.
The page number.
function comment_get_display_page($cid, $node_type) {
$ordinal = comment_get_display_ordinal($cid, $node_type);
$comments_per_page = variable_get('comment_default_per_page_' . $node_type, 50);
return floor($ordinal / $comments_per_page);
}