Unable to boot to Mac OS X Disc

I have a uni-body MacBook with 10.5.7. I would like to wipe the drive with a fresh install, but every time I try to install it reboot over and over. I have tried to hold down C, D, alt/option (with the DVD in and out) and with a hard drive in and out. If the DVD is in no matter what it keep rebooting. If I take the DVD out it starts right up into OS X.
Any help would be greatly appreciated!!!
Thanks!

Hi Whomemc
Why are you wanting to wipe and reinstall Leopard?
First make sure that you have the original Install Disks that came with the MacBook or a Retail copy of Leopard and try restarting while holding only the Option key.
Then once your booted from the Install Disk you have a few options including Testing and Repairing the OS X, an Archive and Install as well as Erase and Install if you so choose.
http://kb.wisc.edu/helpdesk/page.php?id=3810#disk
http://support.apple.com/kb/HT1710
http://support.apple.com/kb/HT2956
Dennis

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