GEvent.addListener(map, “click”, function(overlay, latlng) {

NEW CODE IN HERE SHOULD BE
———-

//only perform the click if the window is closed and the click was directly on the map.
if(!overlay) {
———-

//create an HTML DOM form element
var inputForm = document.createElement(”form”);
inputForm.setAttribute(”action”,”");
inputForm.onsubmit = function() {storeMarker(); return false;};