!!!! Excluding/Including Categories from next_post_link, Single Page Navigation

Please Help!!!

And thanks for looking.

I don’t know how to write what I want to do in php

This concerns the top navigation on the single page templates

If the post is not a child of parent category 81 the next_post_link and previous_post_link will take you through every post except all the children of id=81

if the post is in category 76,74,65,68,66,67 or 75 (the children categories of 81) the next_post_link and previous_post_link will only list posts in the same category as the post you are viewing.

I know there must be a way to do it, but my php grammar is not right and keeps breaking my page…..

whats the best way to write this?

Thanks!!