function setCookie(NameOfCookie, value, expiredays)                 {                    var ExpireDate = new Date ();                    ExpireDate.setTime(ExpireDate.getTime() + (expiredays * 24 * 3600 * 1000));                    document.cookie = NameOfCookie + "=" + escape(value) +                    ((expiredays == null) ? "" : "; expires=" + ExpireDate.toGMTString());                 }                                function getCookie(NameOfCookie)                 {                    if (document.cookie.length > 0)                     {                         begin = document.cookie.indexOf(NameOfCookie+"=");                         if (begin != -1)                            {                             begin += NameOfCookie.length+1;//cookie值的初始位置                             end = document.cookie.indexOf(";", begin);//结束位置                             if (end == -1) end = document.cookie.length;//没有;则end为字符串结束位置                            document.write(document.cookie.substring(begin, end));                           return unescape(document.cookie.substring(begin, end));                       }                         }                       return null;                  }                               function delCookie (NameOfCookie)                  {                      if (getCookie(NameOfCookie))                     {                          document.cookie = NameOfCookie+"="+";expires=Thu, 01-Jan-70 00:00:01 GMT";                       }                  }