If you are trying to restore, DON'T use the drive until you do so. You might overwrite the deleted files.
If you could get your hands on an old Norton utilities disk that works in OS 9 — some are too old, even for OS 9 — Norton's Unerase might recover them. You'd have to boot from the Norton CD, though, because loading it into the computer might overwrite the files, as well.
Ignore any comments about Norton being suicidal. That's only in OS X.