chmod on vfat

[Doug]

Hi all,   i'm new to Linux. and have a question that is bugging me.   i have 3 partitions that are formatted fat32 (w2k), I have fstab set to auto mount with defaults. the permissions by default are 755, when i try to chmod to 775 or 777 it doesn't change, it stays at 755. How can i change them so that when i'm logged in as a user i can write to these drives? or am I stuck with with just using root to write to these drives?   Doug