用asp怎样显示二级菜单?

数据库里有个ProductSort表
ProductSort表的记录是类似这样的
----------表名：ProductSort----------
ID        SortName    ParentID        SortPath
1        白酒            0        0,1,
2        黄酒            0        0,2,
3        进口葡萄酒      0        0,3,
4        国产葡萄酒      0        0,4,
5        啤酒            0        0,5,
6        茅台            1        0,1,6,
7        五粮液          1        0,1,7,
8        剑南春          1        0,1,8,
9        洋河蓝色经典    1        0,1,9,
10        泸州老窖       1        0,1,10,
11        五粮春         1        0,1,11,
12        其他           1        0,1,12,
13        会稽山         2        0,2,13,
14        古越龙山       2        0,2,14,
15        其他           2        0,2,15,
16        雪花           5        0,5,16,
17        绿雨           5        0,5,17,
18        红石梁         5        0,5,18,

其中白酒、黄酒、进口葡萄酒、国产葡萄酒、啤酒为一级菜单,其它为子菜单,
我想实现的功能是先显示一级菜单,然后在每个一菜单下面显示各自的子菜单,
效果演示如[url=http://www.]http://www.[/url]里的产品导航

在百度里搜了好久,都没有解决问题,
请高手指点一下,
谢谢了