Delete all cookies bookmarklet

Delete_all_cookies.bookmarklet.js

/**
* Delete all cookies for current site, using all possible domains.
*/
(function()
{
    var domains = [document.location.hostname];
    var hostParts = document.location.hostname.split('.');
    while (hostParts.length > 2)
    {
        hostParts.shift();
        domains.push(hostParts.join('.'));
    }

    var cookies = document.cookie.split(';');
    for(var i = 0; i < cookies.length; i++)
    {
        var ep = cookies[i].indexOf('=');
        var cookieName = ep > -1 ? cookies[i].substr(0, ep) : cookies[i];
        document.cookie = cookieName + '=; expires=Thu, 01 Jan 1970 00:00:01 GMT;';

        for(var j = 0; j < domains.length; j++)
        {
            var domain = domains[j];
            document.cookie = cookieName + '=;domain=' + domain + '; expires=Thu, 01 Jan 1970 00:00:01 GMT;';
        }
    }

    alert('Deleted ' + cookies.length + ' cookies for domains: ' + domains.join(', '));
})();