Right now I've my posts connecting directly to another one but need a strategy to perform the same goes with pages in the first level.

I figured it might be something such as the code I am already using.

Connecting posts code:

Thank you

Perhaps you have used the "Next Page, Not Next Publish" Wordpress wordpress plugin?

Easily create navigation to brother or sister pages. Much like next_publish_link() and former_publish_link() however for pages. (...) Next Page, Not Next Publish is an extremely simple wordpress plugin that produces navigation between brother or sister pages.

http://wordpress.org/extend/plugins/next-page-not-next-post/