There are 3 previous versions of this script.
// ==UserScript==
// @name Flickr logo
// @description Replace the dodgy Flickr/Yahoo! logo by hiding the Yahoo bit
// @include http://www.flickr.com/*
// @match http://www.flickr.com/*
// ==/UserScript==
var logo = document.getElementById('FlickrLogo');
if (logo) {
var over = document.createElement('div');
over.style.left = '100px';
over.style.height = '15px';
over.style.width = '100px';
over.style.top = '18px';
over.style.background = '#fff';
over.style.position = 'relative';
logo.parentNode.parentNode.appendChild(over);
}