I'm having trouble reverting back to 1 partition from 3

I have a G5 with 10.4.11. There is 3 partitioned drives that I want gone and set back to the original 1 drive. I just cant seem to figure out what im doing wrong. I've read some post's on here and none helped. I dont need anything on the Mac as I have already backed up all info I wanted saved.

When I go into the disk utilities/partitions/volume scheme it shows 3 drives. When I switch the volume scheme to 1 partition their are no options to "apply" for me to revert to 1 partition only.

Some one help please.

 

I figured it out...

Boot off the the install disk, go to Window at the top, open Disk Utility, click on the Hard Drive that you want to Partition back to 1 partition, click on Partition button, set the scheme to Partition 1 and click "Partition". (not "Apply" like others have with Leopard )