// ==UserScript==
// @name           Wikipedia auto-login
// @namespace      http://www.patik.com
// @include        http://en.wikipedia.org/wiki/*
// ==/UserScript==

try {
  if (document.getElementById('pt-login')) {
    var elem = document.getElementById('pt-login');
    if (elem.getElementsByTagName('A')[0].innerHTML.indexOf('Log in') >-1 ) {
      window.location.href = elem.getElementsByTagName('A')[0].href;
    }
  }
}
catch (e) { }