GEvent.addListener(map, "click", function(overlay, latlng)
                {
                    //create an HTML DOM form element
                    var inputForm = document.createElement("form");
                    inputForm.setAttribute("action","");
                    inputForm.onsubmit =
                    function() {
                        selectXY(latlng.lat(),latlng.lng(),map.getZoom()); return false;
                    };
                    //retrieve the longitude and lattitude of the click point
                    var lng = latlng.lng();
                    var lat = latlng.lat();
                    inputForm.innerHTML = '<fieldset style="width:250px;">'

                    + '<legend>Nouvelle position pour