That's not the case. iPhoto and iMovie are buried in the Panther install DVD, and you cannot separately install them without a 3rd-party app.
Google a program called "pacifist."
It will let you extract your package contents from the Panther install DVD. Then click the install icon in the top left, and you'll get iPhoto back.
edit: pacifist, not pacifier. Linky:
http://www.charlessoft.com/