关闭所有信息窗口谷歌地图API V3？

按下其他图钉或单击地图本身时，如何关闭所有信息窗口？我正在使用http://google-maps-utility-library-v3.googlecode.com/svn/trunk/infobox/docs/reference.html和kml叠加层。到目前为止，这是我的JS：

jQuery(document).ready(function ($) {
    function initialize() {
        google.maps.visualRefresh = true;
        var myLatlng = new google.maps.LatLng(51.201465, -0.30244);
        var mapOptions = {
            zoom: 12,
            center: myLatlng,
            mapTypeId: google.maps.MapTypeId.ROADMAP
        };

        var map = new google.maps.Map(document.getElementById('map-canvas'),
        mapOptions);

        var kmlLayer = new google.maps.KmlLayer({
            url: 'http://***.com/new/wp-content/themes/required-starter/CGAGolfAcademies.kml?rand=' + (new Date()).valueOf(),
            suppressInfoWindows: true,
            map: map
        });

        google.maps.event.addListener(kmlLayer, 'click', function (kmlEvent) {
            showInContentWindow(kmlEvent.latLng, kmlEvent.featureData.description);
        });

        function showInContentWindow(position, text) {
            var content = "<div class='info_win'><p>" + text + "</p></div>";
            var infowindow =new InfoBox({
                 content: content,
                 disableAutoPan: false,
                 maxWidth: 0,
                 position: position,
                 pixelOffset: new google.maps.Size(-140, 0),
                 zIndex: null,
                 boxStyle: { 
                  background: "#FBFBFB"
                  ,opacity: 0.90
                  ,width: "280px"
                 },
                 closeBoxMargin: "10px 2px 2px 2px",
                 closeBoxURL: "http://www.google.com/intl/en_us/mapfiles/close.gif",
                 infoBoxClearance: new google.maps.Size(1, 1),
                 isHidden: false,
                 pane: "floatPane",
                 enableEventPropagation: false
        });


    infowindow.open(map);

        }
                    /******AJAX MAP ****/
            siteURL = 'http://' + top.location.host.toString();
            coachesLinks = jQuery('.info_win a');
            coachesLinks.click(function (e) {
                e.preventDefault();
            });
            coachesLinks.click(function (e) {
                alert('FRED');
                $el = jQuery(this);
                URL = $el.attr('href');
                shareurl = $el.attr('href');
                URL = URL + " .main";
                jQuery('#content_two').show('slow').load(URL, function () {
                    scrollToAnchor('content_two');
                    $('.main').css('overflow', 'visible');
                    $('#content_two').css('overflow', 'visible');
                    jQuery('#content_two .back').on('click', function () {
                        jQuery(this).hide('slow');
                        var contentTwo = jQuery('#content_two');
                        if (contentTwo.is(':hidden')) {
                            jQuery('#content_two .back').hide();
                        } else {
                            contentTwo.hide('slow');
                            jQuery('#content > .main').show('slow');
                            jQuery('#content > .main').css('overflow', 'visible');
                            scrollToAnchor('access');
                        }
                    });

                });
                $('#content > .main').hide('slow');
            });

    }

    google.maps.event.addDomListener(window, 'load', initialize);
});