Gravity Effect or Scrool Effect

Hello everybody. I want to add my picture blog this effect but i couldnt figure out any code or any pluging about it. Can someone please help me about it? the link i want to do is music.ivrendi.com

effect works on this page. http://ilkay-ivrendi.tumblr.com/

I just copyed post and past it to thumbler theme and it worked but in wordpres theme it i not working.