thats not so much the case, its just that a normal user doesn't have the rights to mount in which in turn you have to give them rights to do it....
and looper /mnt/cdrom obviously exists if he can mount it as root...
so in your /etc/fstab file where you see the line for you cdrom just add "user" to its options...
so instead of it just saying:
it will say:
then your normal users will be able to mount.