google.maps.event.addListener(pano50, 'click', function() {
fireEvent(document.getElementById("c50").getElementsByTagName("a")[0], 'click');
})

Uncaught TypeError: object is not a function

Function expected on line 817

function fireEvent(element, event){
 if (document.createEventObject){
/* for IE */
return element.fireEvent('on' + event, document.createEventObject());
}else{
/* for other browsers */
var evt = document.createEvent('HTMLEvents');
evt.initEvent(event, true, true);
}
return !element.dispatchEvent(evt);
}

/* for IE */
return element.fireEvent(event, document.createEventObject());