var gpoint;  //加一个全局变量

function showAddress(address) {
    if (geocoder) {
        geocoder.getLatLng(address,
            function(point) {
                if (!point) {
                    //alert("can't parse" + address);
                } else {
                    //alert(point);
                    var marker = createTabbedMarker(point);
                    map.addOverlay(marker);
                    gpoint = point;  //赋值给 gpoint
                }
            }
        );
    }
}