function getCookie(nameOfCookie){ 
    if (document.cookie.length > 0) { 
        begin = document.cookie.indexOf(nameOfCookie+"="); 
        if (begin != -1) { 
            begin += nameOfCookie.length+1; 
            end = document.cookie.indexOf(";", begin);
            if (end == -1) 
                end = document.cookie.length;
            return unescape(document.cookie.substring(begin, end)); 
        } 
    }
    return null; 
}

function setCookie(nameOfCookie, value, expiredays) { 
    var expireDate = new Date ();
    expireDate.setTime(expireDate.getTime() + (expiredays * 24 * 3600 * 1000));
    document.cookie = nameOfCookie + "=" + escape(value) + ((expiredays == null) ? "" : "; expires=" + expireDate.toGMTString());
}