If your pictures are not in correct order in iPhoto:
1. rotate any pictures that need to be rotated
2. put pictures in an album and name the album
3. select all pictures in album
4. Go up to File menu, choose Export
5. Choose File Export. Kind=JPEG, JPEG Quality=Maximum, File Name=Use filename
6. Create a folder to export to on the Desktop (otherwise pictures will be all over the place)
7. Import pictures from folder into Frames 4