Permissions for a FAT partition

[Rich <deblists@osg.saic.com>]

Howdy all,

I want to change the default permissions of files in a FAT partition. I 
understand that FAT file systems have no concept of permission or 
ownership.  When I mount the partition ownership is set to root and 
permissions are set to 755. This means that only root can write to it. 
I'd like it to be writable by ordinary users.
I've tried fiddling the permissions of the mount point, and options to 
the mount command, but have had no luck.  Anyone know how to make my FAT 
partition writable?

thanks,
Rich