I'm not booted into Tiger right now, so I'm not sure if this will work, but you might be able to select all the files, hit Command-Option-I, and make changes in the Get Info window that will apply to all of them at once.
Barring that, you can do this with the Terminal. If the issue is permissions, you can fix it like this:
chown -R <your username> "/Volumes/<hd name>/path/to/folder_containing_files"
chown -R u+w "/Volumes/<hd name>/path/to/folder_containing_files"
Or, if the problem is the "Locked" check box being checked in Get Info, you can fix it like this:
chflags -R nouchg "/Volumes/<hd name>/path/to/folder_containing_files"