Need help reformatting external hard drive set up as RAID 1 ??

[macunkie]

I'm using 10.5 and disk utility and and trying to figure out
how to reformat a 500 gb OWC firewire drive BACK to
one partition of 5OO gbs. It is set up currently as a RAID 1
and two approx drives @ 240 gbs. I've tried everything
with disk utility and can't seem to figure out how to restore
the drive back to one 500 gb (Non Raid) ?

Thanks for any help !!