多级下拉菜单(动态)

效果如下:

程序:/Files/ipusr/topmenu.rar
后台脚本:

--插入测试数据
insert into topmenu([ID],[parentId],[text],[url],[target],[IsBoot],[visible] ,[status])
values(1,0,'深圳','http://singlepine.cnblogs.com/articles/259955.html','self',0,'false','深圳')

insert into topmenu([ID],[parentId],[text],[url],[target],[IsBoot],[visible] ,[status])
values(2,1,'南山','http://singlepine.cnblogs.com/articles/259955.html','self',1,'false','南山')

insert into topmenu([ID],[parentId],[text],[url],[target],[IsBoot],[visible] ,[status])
values(3,1,'福田','http://singlepine.cnblogs.com/articles/259955.html','self',1,'false','福田')

insert into topmenu([ID],[parentId],[text],[url],[target],[IsBoot],[visible] ,[status])
values(4,2,'科技园','http://singlepine.cnblogs.com/articles/259955.html','self',2,'false','科技园')

insert into topmenu([ID],[parentId],[text],[url],[target],[IsBoot],[visible] ,[status])
values(5,3,'塞格','http://singlepine.cnblogs.com/articles/259955.html','self',2,'false','塞格')

insert into topmenu([ID],[parentId],[text],[url],[target],[IsBoot],[visible] ,[status])
values(6,0,'广州','http://singlepine.cnblogs.com/articles/259955.html','self',0,'false','广州')

insert into topmenu([ID],[parentId],[text],[url],[target],[IsBoot],[visible] ,[status])
values(7,6,'广州火车站','http://singlepine.cnblogs.com/articles/259955.html','self',1,'false','广州火车站')