Portfolio elements and top bar not showing

Hi,

I´m having a little problem:
1) When scrolling the homepage it doesn´t seem to be running "gk.scripts.js" or it "stops" somewhere because it doesn´t change the background color of my top menu bar.
2) Probably related is that it doesn´t show the elements of the portfolio widget bellow.

This is the error I get when loading the homepage, maybe it helps:
Error: TypeError: btn.attr(...) is undefined
Source File: http://ibizahouserenovation.com/wp-cont ... ?ver=3.8.1
Line: 24

Thanks in advance.
Marcos.

Hello,

gk.scripts.js is loaded properly on your website, could you send me a PM with backend access? Then I'll be able to check it.