How to mount an image of a partition on a DVD?
 

I used "partimage" (great open-source application) to make a copy of a partition to an external USB HD. I then burned that file onto a DVD in standard ISO format (I can put the DVD in any machine now and see on it my 4GB file which is the image of my partition).
The idea came to me that since I now need a specific file from this backup, that it aught to be possible to put this DVD in my other linux machine (RHEL AS 3) and somehow mount it such that I can then traverse the directory structure on the original system (ext3 btw). Can anyone help? Someone mentioned "-loop" or something, but I am not sure how to make use of that persay.

#su
#mkdir /abc
#mount -t <file system type> -o loop /media/dvd/<image name> /abc