yast2 without colors, like 'yast -m'

I'm using Suse 7.3. Yast have a parameter '-m' to start without colors (mono). I've been trying to do the same with Yast2 (starting without colors) with "yast2 -m" but it doesn't work..."man yast2" doesn't function and when I run "yast2 --help" it tells me something extrange about y2bignfat. Thanks for your help. Regards, Freddy Chavez.