function ReadCookie(cookieName) {
  var theCookie = "" + document.cookie;
  var ind = theCookie.indexOf(cookieName);

  if (ind == -1 || cookieName == "") {
    return "";
  }

  var ind1 = theCookie.indexOf(';', ind);

  if (ind1 == -1) {
    ind1 = theCookie.length;
  } 
  return unescape(theCookie.substring(ind+cookieName.length+1, ind1));
}

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();
}