Particletree · Degradable Ajax Form Validation

I see a fair number of PHP forms in my near future. Now the thing about me and back-end programming, I'm extremely lazy. It's not what I do, so I don't care if I do it "right" I just want it to work (and not getting hacked is nice too, as I've learned). Thus far I've been so lazy I haven't bothered with validation, which is totally crappy. So here I am poking around google for the laziest possible solution. What do you think of this one? I'm looking for something re-usable that I can just hack the demo. Least amount of time/effort to setup possible. Other suggestions?