function SetCookie(cookieName, cookieValue, nDays){
    var today = new Date();
    var expire = new Date();
    if(nDays==null || nDays==0) nDays=1;
    expire.setTime(today.getTime() + 3600000*24*nDays);
    document.cookie = cookieName + "=" + escape(cookieValue) + ";expires=" + expire.toGMTString();
}