It depends on your Apple laptop I believe. Oldworld Macs don't support booting Linux CD-ROMs at all (newworld Macs do) so the common Intel-compatible installation procedure doesn't work anyway.

Use BootX, the Mac/Linux bootloader. You will have the option to choose which OS to boot in a graphical nice little window.
http://www.debian.org/releases/stabl...ot-drive-files
You just copy a few basic files to your MacOS installation and install BootX, then reboot and choose your Linux installation option to boot and install Linux. You can add more choices for BootX later on.
Håkan