无限级树形，兼容以下版本的浏览器：IE5.0+, FF1.06+, Opera8.5+ …… HTML,CSS,Javascr ipt代码相互分离(即数据，风格，脚本三者分离)，可应用于多种场合，易于维护修改；更换树形图标，只需要修改CSS文件. -Unlimited class tree, is compatible with the following browsers: IE5.0+, FF1.06+, Opera8.5+ ... ... HTML, CSS, Javascr ipt

php 树形结构非常漂亮 可以实现2级下拉列表-the php tree is very good you are very good wo bu hui yingwen ni zen