get next next post in single.php

I really need your help.

in my single.php I had to get the next post in the same category

(which i already have by:

$in_same_cat = true;

$excluded_categories=””;

$previous = false;

$next_post = get_adjacent_post($in_same_cat,$excluded_categories,$previous);)

now I need the next next post and also in the opposite direction previous previous post

thanx

See answer here for some code that fetches several adjacent posts:

Getting the Next and Previous Posts Titles in the Sidebar?