How re-map the shortcut key about gnome-terminal

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http://linuxexchange.org – According to the Gnome-Termianl Usage, I found that ctrl+shift+up/down can scroll up/down a line in the terminal. Now, I want to re-map the shortcut key, just like: alt+j/k to scroll up/down a line, that's the old habit of vimer. :) I tried searching the settings in Edit -> Keyboard Shortcuts of Terminal, but found nothing. Can anyone help me? Thanks in advance. The information of my computer is : $ cat /etc/issue Ubuntu 12.10 \n \l (HowTos)