Shame that mouse wheel doesn't work, but you can click on the scrollbar (which is not obvious, because it looks like it's 1px wide). And I used IE.
Makes me wonder why did they want a custom scrollbar in the first place.
I believe "krakozyabra" is used for the symbols in incorrect encoding. The only word that I ever heard for "at" is "собака" (pronounced as suh-buh-kuh)
.mCSB_draggerRail { width: 1px; }