Map Fn keys to change brightness

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http://forums.fedoraforum.org – I have installed Fedora 12 (GNOME) on a VGN-AR41L. I have found that in /sys/class/backlight/nv_backlight I can change the brightness of the backlight. I want to assign the Fn+F5 to decrease the brightness and Fn+F6 to increase. These combinations are recognised from my system as XF86MonBrightnessDown and XF86MonBrightnessUp respectively. Any help? (HowTos)