Lernata GreaseMonkey Script

lernata.user.js

// ==UserScript==
// @name          lernanta
// @namespace     http://www.joanpiedra.com/jquery/greasemonkey
// @description	  Play nicely with jQuery and Greasemonkey
// @author        Joan Piedra
// @homepage      http://www.joanpiedra.com/jquery/greasemonkey
// @include       http://new.p2pu.org/*
// ==/UserScript==

var $;

// Add jQuery
(function(){
    if (typeof unsafeWindow.jQuery == 'undefined') {
        var GM_Head = document.getElementsByTagName('head')[0] || document.documentElement,
        GM_JQ = document.createElement('script');

        GM_JQ.src = 'http://ajax.googleapis.com/ajax/libs/jquery/1/jquery.min.js';
        GM_JQ.type = 'text/javascript';
        GM_JQ.async = true;

        GM_Head.insertBefore(GM_JQ, GM_Head.firstChild);
    }
    GM_wait();
})();

// Check if jQuery's loaded
function GM_wait() {
    if (typeof unsafeWindow.jQuery == 'undefined') {
        window.setTimeout(GM_wait, 100);
    } else {
        $ = unsafeWindow.jQuery.noConflict(true);
        letsJQuery();
    }
}

// All your GM code must be inside this function
function letsJQuery() {
    $("body").css("background","#FFFFFF");
}