BuddyBar mouseover

We are working very hard to make sure our upcoming BP site looks good and runs well on tablets; and one of the main things we're doing in that regard is removing all the "mouseover" and "hover" elements from the interface, as fingers can't do that sort of thing. (On an aside: It's kind of amazing that in this sense, technology is marching *backward*, isn't it?...)

In light of this, we've made the BuddyBar taller, to accomodate fingers. What I want to do now is change all the "onmouseover" elements of the drop-down menus to "on-click" - but I can't locate the point in the code where this happens. Does anybody know what files this might be in? My thanks in advance --