jQuery Forum

I'm using this little scroll spy script with a small navigation: http://jsfiddle.net/mekwall/up4nu/ , the script works fine in my case but now I needs two simple "next / preview" buttons that will scroll to the next or preview anchors from the position where I'm currently at — but i don't have any clue how it could work.. it would be awesome if somebody can help me!

best regards, moritz