Keyboard shortcuts for monitor controls?

[Crunchy in milk]

As I reached blindly for my volume down/up control keys on my apple pro keyboard the other day, I accidentally hit the f15 key, which raised the monitor's contrast a level. On screen a display very much akin to the volume indicator popup, but for contrast appeared. f14 and f15 seem to raise and lower the contrast. I just can't find the keys that raise and lower brightness to go with these, is there a pair of buttons that do this? Which are they or do they require 'enabling' under universal access?

Thanks for any help in advance,
CIM.