http://www.16css.com/menu/905.html

其他树形菜单：很好--1.http://www.cnblogs.com/zhhh/archive/2011/11/25/2263781.html

2.http://blog.csdn.net/songyongfeng/article/details/7383629

3.http://www.cnblogs.com/jihua/archive/2012/10/07/jquerycaidan.html

4.http://www.jq22.com/yanshi941