下拉透明菜单四

mpmenu1=new mMenu('网站首页','/','self','','','','');
mpmenu1.addItem(new mMenuItem(' 用户注册','/register.asp','self',false,'用户注册',null,'','','',''));
mpmenu1.addItem(new mMenuItem(' 用户登录','/login.asp','self',false,'用户登录',null,'','','',''));
mpmenu1.addItem(new mMenuItem(' 用户退出','/login.asp?action=logout','self',false,'用户退出',null,'','','',''));
mpmenu1.addItem(new mMenuItem(' 资料修改','/bbs/MYMODIFY.ASP','self',false,'',null,'','','',''));
mpmenu2=new mMenu('软件下载','/SoftDown/','self','','','','');
mpmenu2.addItem(new mMenuItem(' 系统程序','/softdown/index.asp?CateID=1','self',false,'系统程序',null,'','','',''));
mpmenu2.addItem(new mMenuItem(' 网络工具','/softdown/index.asp?CateID=2','self',false,'网络工具',null,'','','',''));
mpmenu2.addItem(new mMenuItem(' 媒体工具','/softdown/index.asp?CateID=3','self',false,'媒体工具',null,'','','',''));
mpmenu2.addItem(new mMenuItem(' 图文处理','/softdown/index.asp?CateID=4','self',false,'图文处理',null,'','','',''));
mpmenu2.addItem(new mMenuItem(' 桌面工具','/softdown/index.asp?CateID=5','self',false,'桌面工具',null,'','','',''));
mpmenu2.addItem(new mMenuItem(' 程序代码','/softdown/index.asp?CateID=6','self',false,'程序代码',null,'','','',''));
mpmenu2.addItem(new mMenuItem(' 游戏娱乐','/softdown/index.asp?CateID=7','self',false,'游戏娱乐',null,'','','',''));
mpmenu2.addItem(new mMenuItem(' 其他工具','/softdown/index.asp?CateID=8','self',false,'其他工具',null,'','','',''));
mpmenu2.addItem(new mMenuItem(' 特别栏目','/softdown/index.asp?CateID=9','self',false,'特别栏目',null,'','','',''));
mpmenu2.addItem(new mMenuItem(null,null,null,true));
mpmenu2.addItem(new mMenuItem(' 下载排行','/SoftDown/Index.asp?order=AllHits&updown=desc','self',false,'软件下载排行榜',null,'','','',''));
mpmenu3=new mMenu('软件学院','/SoftSchool/','self','','','','');
mpmenu3.addItem(new mMenuItem(' 软件