Move GRUB from USB to HD

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http://unix.stackexchange.com – When I installed Linux debian 2.6 and GRUB I managed to install it, the boot loader, on a usb flash drive. Right now, If the USB drive is plugged into the computer, the GRUB and the OS starts, otherwise, if the usb is out, nothing happens. There are some grub files in /boot/grub/ and /usr/lib/grub/i386-pc/ but there's no e.g. menu.lst in these directories, but a lot of other files. To be honest, I don't know if I actually installed GRUB on the flash drive or not, but I can't start the OS without having the Flash drive inserted. Well, what I would like to do is to be able to start the OS wi (HowTos)