This is the code
// ==UserScript==
// @name Wood Background
// @namespace http://www.nationstates.net/nation=ellorn
// @description Changes bac
For just style changes, use the Stylish add-on (some variant of this is available on almost every browser).
Stylish is faster, lighter, and easier than Greasemonkey or userscripts. There are plenty of pre-made styles available at userstyles.org.
Barring that, use built-in functions, like GM_addStyle().
The following script works on Firefox and Chrome, and probably a few other browsers. (There was a syntax error in the CSS string) :
// ==UserScript==
// @name Wood Background
// @namespace http://www.nationstates.net/nation=ellorn
// @description Changes background to wood finish
// @include http:*//w11.zetaboards.com/Allied_Republics/*
// ==/UserScript==
GM_addStyle (
"* { background: #00ff00 "
+ "url('http://awesomewallpapers.files.wordpress.com/2010/01/wooden_top.jpg')"
+ " no-repeat fixed center; }"
);
Note that it would be best to replace the * with body.