Internet Explorer 7 DOM Events: "Function Expected"
Reported by Kyle Florence | April 19th, 2008 @ 12:04 PM
Nevermind, turns out this line was causing the problem:
var element = (event instanceof Event) ? event.element() : $(event);
Still not really sure why. Anyways, I also discovered that IE doesn't support 'click' events on options, or 'change' events on div's surrounding SELECT lists, it must be on the select list itself! Hope that saves someone time.