callback for pinterest button

Hello, I found this code for callback social buttons after load the second page

var el = document.body; 

//Google Plus
if (typeof gapi !== "undefined") { gapi.plusone.go(el); }

//Facebook
if (typeof FB !== "undefined") { FB.XFBML.parse(el); }

//Twitter
if (typeof twttr !== "undefined") { twttr.widgets.load(); }

Do you know which code I have to add for pinterest button ??
thank you!

http://ww.wp.xz.cn/plugins/infinite-scroll/