mal cookie remover

// ==UserScript==
// @name        MAL-CookieRemover
// @description When the MyAnimeList.net login becomes invalid because the ip changed, this script deletes the cookies and redirects to the login page (and back to the previous page after login).
// @namespace   http://userscripts.org/users/524082
// @include     /^https?:\/\/(.*\.)*myanimelist.net\/.*$/
// @grant       none
// @version     1.0
// ==/UserScript==

function clearCookies() {
    // code from http://stackoverflow.com/questions/2194473/can-greasemonkey-delete-cookies-from-a-given-domain
    var domain      = document.domain;
    var domain2     = document.domain.replace (/^www\./, "");
    var domain3     = document.domain.replace (/^(\w+\.)+?(\w+\.\w+)$/, "$2");

    //listCookies (); //-- Optional, for information or debug...

    //--- Loop through cookies and delete them.
    var cookieList  = document.cookie.split (';');

    for (var J = cookieList.length - 1;   J >= 0;  --J) {
        var cookieName = cookieList[J].replace (/\s*(\w+)=.+$/, "$1");

        //--- To delete a cookie, set its expiration date to a past value.
        document.cookie = cookieName + "=;expires=expires=Thu, 01-Jan-1970 00:00:01 GMT;";
        document.cookie = cookieName + "=;path=/;expires=expires=Thu, 01-Jan-1970 00:00:01 GMT;";
        document.cookie = cookieName + "=;path=/;domain=" + domain  + ";expires=expires=Thu, 01-Jan-1970 00:00:01 GMT;";
        document.cookie = cookieName + "=;path=/;domain=" + domain2 + ";expires=expires=Thu, 01-Jan-1970 00:00:01 GMT;";
        document.cookie = cookieName + "=;path=/;domain=" + domain3 + ";expires=expires=Thu, 01-Jan-1970 00:00:01 GMT;";
    }

    //listCookies (); //-- Optional, for information or debug...

    //-- Optional function, for information or debug...
    function listCookies () {
        var cookieList  = document.cookie.split (';');

        for (var J = 0, numCookies = cookieList.length;   J < numCookies;  ++J) {
            console.log ("Cookie ", J, ": ", cookieList[J]);
        }
    }
}

if(document.body.innerHTML.contains("clear your cookies")) {
    clearCookies();
    if(!window.location.href.contains("login.php")) {
        localStorage.setItem("redirectURL", window.location.href);
        window.location.href = "http://" + document.domain + "/login.php";
    }
}

var redirectURL = localStorage.getItem("redirectURL");
if(redirectURL !== null && document.cookie.contains("Z=")) {
    localStorage.removeItem("redirectURL");
    window.location.href = redirectURL;
}