Well that may be part of the problem then since iDVD is not a program you can download from the Apple website- only updaters for it are available there.
If you are sure it has been removed from your Applications folder and trashed, you need to reinstall it from the disks that came with your computer or from the iLife disk you may have purchased separately.
If you are sure it has been removed from your Applications folder and trashed, you need to reinstall it from the disks that came with your computer or from the iLife disk you may have purchased separately.