comment respond javascript not working when repliying comments

i really hope that someone help me with this

i’m using wordcult theme, everything seems to be coded fine, comment-reply.js is loaded, there is a respond div and everything, but whenever you reply to a comment, the “trick” is not working, it as if javascript is turned off…
how could this be happening? i don’t have javascript turned off, i’m using firefox, ie 7, chrome, etc…

url is 7kc.com.ar

thank you!!