Breadcrumbs relative to wp_nav_menu

I have a blog page that uses breadcrumbs. Currently they only go 3 levels deep, here is the bit of code:

<?php
						if($post->post_parent){
							$new_parent = get_post($post->post_parent);
							if($new_parent->post_parent){
								echo '<a href="'.get_permalink($new_parent->post_parent).'">'.get_the_title($new_parent->post_parent).'</a> <span class="raquo">&raquo; </span>';
							}
							echo '<a href="'.get_permalink($post->post_parent).'">'.get_the_title($post->post_parent).'</a> <span class="raquo">&raquo;</span>';
						}
					?>
					<?php wp_title(''); ?>

The problem is that is specifically what the parents are of the pages, I want the parents relative to the menu I currently have. I have searched google and so far no good. Anyone have any ideas?