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();
}

var cook = document.cookie;
function getCookie(name) {
 var index = cook.indexOf(name + "=");
 if (index == -1) return null;
 index = cook.indexOf("=", index) + 1;
 var endstr = cook.indexOf(";", index);
 if (endstr == -1) endstr = cook.length;
 return unescape(cook.substring(index, endstr));
}