function WriteCookie(sName,sValue,iDayAfter)
{
  if (sName.length <= 0)
    return false;

  dExires = new Date();
  dExires.setTime(dExires.getTime() + iDayAfter*(24*60*60*1000));
  if (iDayAfter = -1)
    document.cookie = escape(sName)+"="+escape(sValue)+";";
  else
    {
      var sExires = dExires.toGMTString();
      document.cookie = escape(sName)+"="+escape(sValue)+";expires="+sExires;
    }
  return true;
}