I am trying to install a LCD monitor into an elevator which can play
videos (WMV) and still pictures (JPG/GIF) I have found several
companies that provide steel casings for the LCD monitor and a
Monitor.  My only problem now is finding a movie/image player to feed
the LCD monitor.  The inputs for the LCD monitor are the following:

STANDARD: Analog 15 Pin D-Sub
OPTIONAL: NTSC, PAL, S-VIDEO

I also need to know where the power will come from (ie above elevator?)

Would a mobile DVD player meet your needs?

http://froogle.google.com/froogle?q=mobile+dvd+player

You'd still have to power it.  Perhaps the elevator has a 110V
junction box on top for the lights?  Just make sure you get a
professional electrician if you need to do any wiring.

-- Carl