rmLaRiservaJunk.user.js

// ==UserScript==
// @name          Remove LaRiserva junk
// @updateURL     about:blank
// @date          2012-05-24
// @version       1.0
// @description   Remove that pesty over-bloated LaRiserva junk
// @include       http://lariserva.forumcommunity.net/*
// ==/UserScript==

// Author: Klemen Tušar
// License: MIT License

var
    header = document.getElementsByClassName('skin_tbl')[0],
    signatures = document.getElementsByClassName('signature');

header.parentNode.removeChild(header);

for (var i = signatures.length - 1; i >= 0; i--) {
    signatures[i].parentNode.removeChild(signatures[i]);
}