Referencing Firefox event objects via JavaScript

Question

I am still using Google maps v2, and I am having trouble getting the event object from Firefox when a google event fires. Ultimately, I need the event object so that I can retrieve information about keys being pressed when the click event of a particular overlay fires. Here is some code:

GEvent.addListener(polys[i], "click", function(e) {
    var evtObj = window.event? event : e;
    for (var i=0; i<polys.length; i++) {
        if ( this == polys[i] ) {
            if (evtObj.ctrlKey) {
                map.closeInfoWindow();
                clickCounty(labels[i]);
            }
            other stuff to happen....
        }
});

This works fine in IE and Chrome. The variable e passed into the function is the lat/long of the click event. So how would I reference the Firefox event object rather than the Google event lat/long..?