Permissions problem with Konqueror

Hey ya'll, I got a problem here:

I have the following line in my fstab:
/dev/hdb1 /mnt/media vfat noexec,umask=003,gid=500 0 0

I am a member of group 500 "vfat" and after this mount, I can r/w to
my windows share in any terminal. HOWEVER, when I try to write to the
share in Konqueror, rename, or move, it gives me a write permission
error. I don't understand why, if I can write to it in terminal, can't
Konqueror do the same when I spawn it? the process is running with my
uid. Do I need to set the setgid bit for the Konqueror binary to true?

any other suggestions aside from ditching windows :P ?

-Peter