I downloaded iWeb, and suddenly my iPhoto disappeared?

I had to download iWeb from the iLIfe '11 DVD. I customized it so I only downloaded iWeb, and no other app from the DVD. However, I noticed later that my iPhoto was gone. I did the spotlight search, and I don't have iPhoto anywhere on my hard drive, and I don't even have the iPhoto Library folder. Huh??? Why did it disappear, how do I get it back, and how do I get my photos back? Help! (I have a MacBook Pro, OS X 10.8.3)