How did I do it?!?

I've had these pictures from IKEA waiting to be hung on my dining room wall for several weeks. The problem? There's no floor under this wall. It's over the stairs which lead to the basement. I considered the possibility of shooting the nails across the chasm with a nail gun, but good sense and a few key pieces of equipment came to the rescue. How did I hang these frames?
Sent from my Verizon Wireless BlackBerry