Simple, no-dependency JavaScript to set and delete cookies

cookies.js

function setCookie(name, value, days) {
    var t = new Date();
    t.setDate(t.getDate() + days);
    document.cookie = encodeURIComponent(name)+'='+encodeURIComponent(value)+'; expires='+t.toUTCString()+'; path=/';
}

function deleteCookie(name) {
    // value is an empty string
    document.cookie = encodeURIComponent(name)+'=; expires=Thu, 01 Jan 1970 00:00:00 GMT; path=/';
};

function deleteCookie_alt(name) {
    setCookie(name, '', -1);
};