javascript - Hand up and down with parrallax effect -

i'm creating landing page selfmade application (its schoolproject). when load page see animation pops iphone in wrist.

what i'm trying create parrallax effect. when scroll down, hand go down , when scroll hand go based on scrollspeed.

at moment made work animations animate.css want step game adding parrallax effect.

here can see how looks @ moment http://faces.jorendemaeyer.be

you guys have idea's how can that?

have checked out skrollr library? works , easy set up. github page ihatetomatoes.com has great tutorials , documentation started whatever might need.

good luck!