$[fg.cs<n>]
$[bg.cs<n>]
$[hilight.cs<n>]
$[shadow.cs<n>]
These parameters are replaced with the name of the foreground
(fg), background (bg), hilight (hilight) or shadow (shadow)
color that is defined in colorset <n> (replace <n> with zero or
a positive integer). For example "$[fg.cs3]" is expanded to
the name of the foreground color of colorset 3 (in
rgb:rrrr/gggg/bbbb form). Please refer to the COLORSETS sec-
tion for details about colorsets.