next news post

I like the nextpage droplet a lot, I want a similair thing for the newsmodule, where visitors can push a button that brings them to either the next of the previous newspost (longtext).

## visitor opens the newspage, opens a newsitem, reads it and at the bottom he gets the option to directly enter the next full newsmessage ##

I have been looking at the nextpagedroplet but this takes the showmenucode as reference for the page-order...
and as the longtext for the newsitems are in the pages/posts folder they are nog seen by the showmenu.

Is there someone who knows how this can be done / where to start?