eventListener.js

// addEventListener polyfill IE6+
if ( !window.addEventListener ) {
	(function ( win, doc ) {
		var Event, addEventListener, removeEventListener, head, style;

		Event = function ( e, element ) {
			var property, instance = this;

			for ( property in e ) {
				instance[ property ] = e[ property ];
			}

			instance.currentTarget =  element;
			instance.target = e.srcElement || element;
			instance.timeStamp = +new Date();

			instance.preventDefault = function () {
				e.returnValue = false;
			};

			instance.stopPropagation = function () {
				e.cancelBubble = true;
			};
		};

		addEventListener = function ( type, listener ) {
			var element = this, listeners, i;

			listeners = element.listeners || ( element.listeners = [] );
			i = listeners.length;
			
			listeners[i] = [ listener, function (e) {
				listener.call( element, new Event( e, element ) );
			}];

			element.attachEvent( 'on' + type, listeners[i][1] );
		};

		removeEventListener = function ( type, listener ) {
			var element = this, listeners, len, index;

			if ( !element.listeners ) {
				return;
			}

			listeners = element.listeners;
			i = listeners.length;

			while ( i-- ) {
				if (listeners[i][0] === listener) {
					element.detachEvent( 'on' + type, listeners[i][1] );
				}
			}
		};

		win.addEventListener = doc.addEventListener = addEventListener;
		win.removeEventListener = doc.removeEventListener = removeEventListener;

		if ( 'Element' in win ) {
			Element.prototype.addEventListener = addEventListener;
			Element.prototype.removeEventListener = removeEventListener;
		} else {
			head = doc.getElementsByTagName('head')[0];
			style = doc.createElement('style');

			head.insertBefore( style, head.firstChild );

			style.styleSheet.cssText = '*{-ms-event-prototype:expression(!this.addEventListener&&(this.addEventListener=addEventListener)&&(this.removeEventListener=removeEventListener))}';
		}
	}( window, document ));
}

@chmartinez me too, on line 33... did you ever find out why?

Same error as the other two - exceptions on call. Likewise failing in IE8 via Browserstack, although the debug information isn't as verbose.