gk.scripts.js error

Hi, I am using sporter template on Joomla! 2.5.6 Stable , I upgraded template and I am continue having this "error" (using firebug I found it, site is: trasnochados dot com):

TypeError: $(document.body).addEvent is not a function
$(document.body).addEvent("click", function(e){
gk.scripts.js (line 168)

I was looking in the forum and searching in other sites, but I did not find similar issues... I will appreciate your help to solve this problem. Tks!!

I've checked firebug console on latest quickstart and it is clean. Did you use the login and register modules at the top of the page ?

Yes, I am using it.

Looks like something have to goes wrong during update process. Could you overwrite all files again ?