setCookies.js

function setCookie(cookie_name, cookie_value, expire_days) {
    var date = new Date();
    date.setTime(date.getTime() + (expire_days*24*60*60*1000));
    var expires = "expires="+date.toUTCString();
    document.cookie = cookie_name + "=" + cookie_value + "; " + expires;
}

function getCookie(cookie_name) {
    var name = cookie_name + "=";
    var ca = document.cookie.split(';');
    for(var i=0; i<ca.length; i++) {
        var c = ca[i];
        while (c.charAt(0)==' ') c = c.substring(1);
        if (c.indexOf(name) != -1) return c.substring(name.length, c.length);
    }
    return "";
}