Userscripts.org

// ==UserScript==
// @name           Yahoo Games Sponsor Skip
// @namespace      http://userscripts.org/users/23652
// @description    Automatically skips the sponsor page for you
// @include        http://games.yahoo.com/*
// @copyright      JoeSimmons
// ==/UserScript==

function main() {
if(/is brought to you by our sponsor/.test(document.body.textContent)) {
var l = document.evaluate("//a[contains(@href, '/games/login2?page=')]",document,null,9,null).singleNodeValue;
if(l) {top.location=l.href;}
}
}

window.addEventListener('load', main, false);