can't rebuild iphoto library

Hi - While I was importing some photos from a camera, iphoto crashed and when I reopened it, all my library photos from 2004 on were gone. I read a few threads about rebuilding the library, however, when I choose that function (disk utility), nothing happens. I can see the photos under Pictures and the library is there, I just can't access it in iphoto. I'm using iphoto 6 and OSX 10.6.8. Please help!

thanks.