Or you could do it via constants:
Const color_red=$FF0000 Const color_green=$00FF00 Const color_blue=$0000FF Const color_yellow=$FFFF00 Function Colour(rgb,g=-1,b=-1) If g=-1 Color 0,0,rgb Else Color rgb,g,b EndIf End Function Colour color_red Text 10,10,"Red" Colour color_green Text 10,30,"Green" Colour color_blue Text 10,50,"Blue" Colour color_yellow Text 10,70,"Yellow" Colour 255,255,255 Text 10,90,"White" MouseWait