function getCookie(name) {
    var dc = document.cookie;
    var prefix = name + "=";
    var begin = dc.indexOf("; " + prefix);
    if (begin == -1) {
        begin = dc.indexOf(prefix);
        if (begin != 0) return null;
    } else
        begin += 2;
    var end = document.cookie.indexOf(";", begin);
    if (end == -1)
        end = dc.length;
    return unescape(dc.substring(begin + prefix.length, end));
}

function setCookie(name, value, expiredays) {
    var todayDate = new Date();
    todayDate.setDate(todayDate.getDate() + expiredays);
    document.cookie = name + "=" + escape(value) + "; path=/; expires=" + todayDate.toGMTString() + ";"
} 

//function setCookie(name, value, expiredays) {
//    var expire_date = new Date();
//    expire_date.setDate(expire_date.getDate() + expiredays);    
//    document.cookie = name + "=" + escape(value) + "; expires=" + expire_date.toGMTString() + "; path=/";
//}

//var today = new Date();
//var expiry = new Date(today.getTime() + 28 * 24 * 60 * 60 * 1000);

//function setCookie(name, value, expires) {
//    document.cookie = name + "=" + escape(value) + ((expires) ? "; expires=" + expiry.toGMTString() : "");
//}