Specify the colours used for drawing the link.
red, green and blue are numbers from 0 to 255.
OUTLINECOLOR, BWOUTLINECOLOR and BWBOXCOLOR have an additional option - 'none' - which stops that element of the link being drawn.
COMMENTFONTCOLOR also has an extra option - 'contrast' - which will choose black or white, depending on the colour of the link. This is most useful with COMMENTSTYLE center.
The colours are used as follows:
COMMENTFONTCOLOR contrast with
COMMENTSTYLE center