You need to change permissions ...
In /etc/fstab, consider adding "user" somewhere (on the line concerning your floppy drive, just after "default" is there is one) ... Reading "man fstab" might help ...
You should also change permissions on the directory you mount your floppy : chown a+rwx /mnt/floppy (if /mnt/floppy is the directory)
Repost if problem persist