I am mounting a iso file with the following:

mount -o loop -t iso9660 /home/user/cdimage1.iso /mnt/loop

the /mnt/loop is 777, the file is 777, it mounts ok, but now I want to write information back into the iso file, is there a way to mount it RW so I can edit the file on the fly as you can with say winiso in windows, it will allow me to modify a file in the iso. I know I can extract and rebuild the iso, but I do not want to do that, i want to edit it on the fly. Is there a way to mount RW, or perhaps there is a linux app that can handle that function for me. please advise.

Thanks in advance,

Neal...

doesnt even winiso remake the whole iso when edited?
iso is supposed to be ro, not rw afaik

No, the iso9660 file system is a read-only filesystem and can't use the "rw" mount option.