Can't downgrade 10.5 to the original 10.4 on MacBook

Hi there!
I've upgraded my MacBook that came with 10.4 to 10.5. Now I wan't to "downgrade" to 10.4 as 10.5 isn't running as smoothly as i had hoped on the Book. (I love it on my iMac 24" though)
Problem: I can't !
I started by saving my files and erasing the hard-drive to do a clean-sweep. Since I've tried with the original installdisc that came with the MacBook, I've tried with the "Mac OS X.4 - Tiger" that i bought when Tiger was released and neither works ;(
No matter wich disc i try to use - i get the message that I can't install the software on the MacBook. I've checked the harddrive and it's fine (empty) and there seems to be nothing wrong with the MacBook.
Has the install of 10.5 somehow changed the firmware of the Book or what have happened??
What to do?? (I know the best answer is to by the MacBookAir - i'm on the way - but I'd still like to keep the old MacBook for my kids)
I hope someone ha a good idea! I miss my MacBook
Best regards
Peter

Restart the machine, holding down the CMDOPT+PR keys until you get three bongs, that should bring up a flashing folder w/question mark. Pop in the restore disk that came with the machine and see if it'll boot from it. If not, restart the machine and hold down the C key, which should force it to boot with the restore disk. If not, report back.
If so, restore the software and after restart, boot with the Tiger install disk, and install it. Once you've done that, get a bootable, external HD (FireWire's better than USB), and make a bootable backup/clone before upgrading/updating and ensure that works like the original. That allows you to revert to the previous good state without having to reinstall anything. See these for details:
http://docs.info.apple.com/article.html?artnum=106941
http://www.macmaps.com/upgradefaq.html
http://www.macmaps.com/backup.html
http://www.thexlab.com/faqs/installswupdates.html
http://www.thexlab.com/faqs/backuprecovery.html

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