Rewrote backlight manager

bin/scripts/backlight

@@ -4,6 +4,7 @@
 #   backlight get
 #   backlight set [value]
 #   backlight max
+#   backlight [up|down] [delta]
 #
 # Returns:
 #	Set - nothing
@@ -19,9 +20,9 @@ function backlight
 		case "set"
 			xbacklight -set $argv[2]
 		case "up"
-			xbacklight -inc 10
+			xbacklight -inc $argv[2]
 		case "down"
-			xbacklight -dec 10
+			xbacklight -dec $argv[2]
 		case "*"
 			echo "Unknown function \"$argv[1]\""
 			echo ""