I had to replace my hard drive awhile back and first backed up the entire contents to an external hard drive via time machine back up. I'm wanting to find some photos on that HD now - I connected it to my laptop, clicked the time machine icon at the top of the screen, clicked through until I got to the folder called Pictures, then clicked the coloured icon iphoto library. All that came up was the size of the folder, 36 GB, but I couldn't get to the pictures - there was nowhere to click to open the library of photos. How do I access the photos?