configure grub in debian

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http://www.linuxquestions.org – debian wheezy is only one OS on my an old netbook. so I don't want grub appears at boot but I want a key like "Shift" or any to force grub show at boot. how can I configur for it. I know it is easy task but I messed up my /etc/default/grub and a bit confused with many posts mostly on ubuntu forums. I did like this Quote: GRUB_DEFAULT=0 GRUB_HIDDEN_TIMEOUT=3 GRUB_HIDDEN_TIMEOUT_QUIET=false GRUB_TIMEOUT=0 GRUB_DISTRIBUTOR=`lsb_release -i -s 2> /dev/null || echo Debian` GRUB_CMDLINE_LINUX_DEFAULT="quiet" GRUB_CMDLINE_LINUX="" gr (HowTos)