setcookies.js

var setCookie = function(name, value, days, domain) {
    var expires;
    if (days) {
        var date = new Date();
        date.setTime(date.getTime() + (days * 24 * 60 * 60 * 1000));
        expires = "; expires=" + date.toGMTString();
    }
    else {
        expires = "";
    }
    document.cookie = name + "=" + value + expires + "; path=/;domain=.example.com";
};

function set_cookie(name, value, expires, domain, path){
    if (!expires){
        expires = new Date()
    }else{
        var date = new Date();
        date.setTime(date.getTime() + (expires * 24 * 60 * 60 * 1000));
        expires = date;
    }
    document.cookie = name + "=" + value +
        ((expires === null) ? "" : "; expires=" + expires.toGMTString()) +
        ((path === null) ? "" : "; path=" + path) +
        ((domain === null) ? "" : "; domain=" + domain);
}