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\')