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Your picture link is broken.
Remember, that you can only turn on your keyboard backlight when it's in the dark. If you want to turn it on in daylight use:
Lab Tick

sorry here is the link....and on my MBP i "was" able to turn my backlight on and off during the day....now i cant turn it on period....the last pic i had was on my OS X...here it is on my Windows...its the same thing just that im on windows now cause i was playing CoD4

http://img87.imageshack.us/my.php?image=capturevz0.jpg
 
Have you tried Lab Tick under Mac OS X?
If it does not work and it is a 17" MBP (does not apply to the 15"!),
maybe the ribbon wire to the keyboard is broken. If you take out the battery, you can see the 2 wires. Put a small piece of paper between the case and the wires, just where they disappear into the case. This will insulate the wires against the case. (There is a small cutaway for the wires, this is where the paper goes. If you look inside the battery compartment, put the paper on top of the wires.) You just need to insert it 1mm, and fasten it with sticky tape.
(This solved my keyboard issues, as a permanent solution I used insulation tape, but this required the disassembly of the top case.)
Disclaimer: Of course, this is at you own risk. Don't use force to insert it!
 
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