How to delete a RAID set in Disk Utility?

I set up a mirrored RAID set with two 80GB disks on a 500MHz G4 "sawtooth", then installed Tiger successfully. Statup Disk on the Tiger DVD recognizes it as a valid startup disk, but it won't boot (stays on the white screen with the large apple).
So, I decided to go back to two separate disks with no RAID, but Disk Utility won't seeem to let me delete a RAID set. It shows the volumes as locked (no apparent way to unlock them), and also doesn't allow me to format the underlying drives (bad file descriptor error).
Any suggestions on how to undo a RAID set in Tiger?
Thanks,
0g
G4 "Gigabit" Dual-500 Mac OS X (10.4.8) 1.5GB RAM, 1TB internal, SCSI, 802.11g, USB2.0

Boot from your OS X Installer Disc. After the installer loads select your language and click on the Continue button. After the menubar appears select Disk Utility from the Utilities menu (Installer menu for Panther.) After DU loads select the main entry of the RAID (the one with the RAID size) then click on the RAID tab in the DU main window. Select the main RAID entry from the icon list (the one that says "Mirrored RAID Set" and should have the word "Online" in green. Then click the Delete button down below the list view.
Be sure to backup first because this could cause complete loss of data.
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