Review for Buttons! by Kaatje1970
Rated 5 out of 5 stars
You can create a new button.
Click on 'add new button'. Fill in name (previous/next) and place behind '/*CODE*/' what stands on this site:
http://custombuttons.mozdev.org/drupal/content/buttons-prevnext-read-messages#comment-313
To create your own collections, you must have a Mozilla Add-ons account.