change default desktop

hi,everyone,     I have a problem and I very hope you can help me,I need your help.Thanks very much!     I download the lxde,I use these command ,"yum groupinstall lxde", "yum install lxlauncher".And now I can use the "lxlauncher" command,so the desktop is changed.     Now I want to change the "lxauncher" to be the default desktop,when I restart the PC but I don't want to use the "lxlauncher" command in the terminal.So how can I do? Which configuration file I can modfiy.     BTW,which is the default desktop  configuration file?/etc/gdm or /etc/X11 or /etc/kde?     I hope you help me,thank you very much! The best regards, Williams ___________________________________________________________ 好玩贺卡等你发，邮箱贺卡全新上线！ http://card.mail.cn.yahoo.com/