Nested sets - update/move nodes with child nodes

Hi all, I'd like some feedback please, if possible.

I'm trying to manage menu items (add new, update and delete items) using nested sets. I have followed these articles
http://mikehillyer.com/articles/managing...-in-mysql/
http://www.sitepoint.com/hierarchical-data-database/
which helped me build the required queries and created the functionality for adding new nodes and delete existing ones.

The problem is that I can't figure out how to do the update functionality, for instance to move a node (either is root node or child node) and all its child nodes/menu items under another node (so the selected node will become a child one) or organize order of the nodes on each level etc.

thanks in advance

Try this library

https://github.com/olimortimer/ci-nested-sets