[Therion] preview below with many colors

i'm making a therion map with many colors for the maps previewed below. attached is a snapshot of the map (still in draft) in acroread. with xpdf does not look so good (... maybe my mistake). it would also be nice to have transparency in the below colors, and that the order of the below areas reflect that of the selected map(s) (or, better, altitude) is it possible ? thanks. marco