in your Finder, go to your user folder -> iPhoto Library -> and drag the pictures out...
Heather,
That is not the recommended method. Dragging photos out of the iPhoto Library Folder through the finder is very messy business and extremely time consuming.
This will also destroy the iPhoto Library.
The recommended method is to export the photos from iPhoto from the menu or drag them from the window to the desktop.
An easy way to get the pictures you want out of an iPhoto Library is to use this:
iPhoto Extractor ( scroll for the version you need)
http://homepage.mac.com/butlers/iPhotoExtractor/DownloadiPhotoExtractor.htm
If you are going back to an earlier version of iPhoto, you can not use or access an iPhoto Library created in a newer version of iPhoto.
Peter