And is it a RETAIL DVD or an UPGRADE DVD? Though even the 29 USD Mac OS X 10.6 Snow Leopard Upgrade DVD, once available via the Retail Stores, now only available online, is able to install Mac OS X on any Intel Mac without any prior version of Mac OS X on it.
Have you access to any other Mac with Firewire? Maybe you could use
Target Disk Mode somehow to install 10.6 on the Tiger MBP.