Is there still a shortcut to invert colors on ipad2?

I just started using an ipad and got all happy when I read a tips and tricks article that said that I could triple click the home button to get a fast way to toggle the white on black. But alas, when I tried it, it didn't work. I guess it must have been an ipad 1 feature that went away with the ipad 2. So does anyone know a way on ipad 2 to toggle the invert colors without having to do all the navigating through settings for it?

That's not a default function but it's there. You just need to switch it on.
Go to Settings - General - Accessibilty - scroll down to Triple-click home and choose invert colours

Aha! So that's how it works! Much better! Thank you! That'll save me a lot of screen poking!