document.write("<li><a href=\"install.htm\" target=\"_self\">环境要求</a>");
document.write("<li><a href=\"install_note.htm\" target=\"_self\">安装说明</a>");
document.write("<li><a href=\"upgrade.htm\" target=\"_self\">升级说明</a>");
document.write("<li><a href=\"install_un.htm\" target=\"_self\">卸载说明</a>");
document.write("<li><a href=\"install_cons.htm\" target=\"_self\">文件及目录结构</a>");