//取得项名称为offset的cookie值 
      function  GetCookieVal (offset)
      {
          var  endstr = document .cookie.indexOf (";" , offset);
          if  (endstr == -1 )
          endstr = document .cookie.length;
          return  unescape(document .cookie.substring(offset, endstr));
      }
      //取得名称为name的cookie值
      function  GetCookie (name) {
          var  arg = name + "=" ;
          var  alen = arg.length;
          var  clen = document .cookie.length;
          var  i = 0 ;
          while  (i < clen)
          {
              var  j = i + alen;
              if  (document .cookie.substring(i, j) == arg)
              return  GetCookieVal (j);
              i = document .cookie.indexOf(" " , i) + 1 ;
              if  (i == 0 ) break ;
          }
          return  null;
      }
      //删除名称为name的Cookie
      function  DeleteCookie (name) 
      {   
          var  exp = new  Date();
          exp.setTime (exp.getTime() - 1 );
          var  cval = GetCookie (name);
          //var  cval = iNettuts.getCookie('HieWay.Woall.UtilityHelper.UserCookieInfo',name)
          document .cookie = name + "="  + cval + "; expires="  + exp.toGMTString();
          
      }
      function  ClearCookies()
      {
          if (confirm('你确定要清空所有COOKIE吗？' ))
          {
              var  temp=document .cookie.split(";" );
              var  ts;
              for  (var  i=0 ;;i++)
              {
                  if (!temp[i])break ;
                  ts=temp[i].split("=" )[0 ];
                  DeleteCookie(ts);
              }
              alert('COOKIE已清除！' );
          }
      }