google marker loader

 <script type="text/javascript">
    //<![CDATA[

    if (GBrowserIsCompatible()) {
      var side_bar_html = "";
      var gmarkers = [];
      var htmls = [];
      var i = 0;

      // A function to create the marker and set up the event window
      function createMarker(point,name,html) {
        var marker = new GMarker(point);
        GEvent.addListener(marker, "click", function() {
          marker.openInfoWindowHtml(html);
        });
        gmarkers[i] = marker;
        htmls[i] = html;
        side_bar_html += '<a href="javascript:myclick(' + i + ')">' + name + '<\/a><br>';
        i++;
        return marker;
      }


      // This function picks up the click and opens the corresponding info window
      function myclick(i) {
        gmarkers[i].openInfoWindowHtml(htmls[i]);
      }


      // create the map
      var map = new GMap2(document.getElementById("map"));
      map.addControl(new GLargeMapControl());
      map.addControl(new GMapTypeControl());
      map.setCenter(new GLatLng( 43.907787,-79.359741), 9);


      // A function to read the data
      function readMap(url) {
        var url="map11.php?q="+url;
        var request = GXmlHttp.create();
        request.open("GET", url, true);
        request.onreadystatechange = function() {
          if (request.readyState == 4) {
            var xmlDoc = request.responseXML;
            // obtain the array of markers and loop through it
            var markers = xmlDoc.documentElement.getElementsByTagName("marker");

            // hide the info window, otherwise it still stays open where the removed marker used to be
            map.getInfoWindow().hide();

            map.clearOverlays();

            // empty the array
            gmarkers = [];

            // reset the side_bar
            side_bar_html="";

            for (var i = 0; i < markers.length; i++) {
              // obtain the attribues of each marker
              var lat = parseFloat(markers[i].getAttribute("lat"));
              var lng = parseFloat(markers[i].getAttribute("lng"));
              var point = new GLatLng(lat,lng);
              var html = markers[i].getAttribute("html");
              var label = markers[i].getAttribute("label");
              // create the marker
              var marker = createMarker(point,label,html);
              map.addOverlay(marker);
            }
            // put the assembled side_bar_html contents into the side_bar div
            document.getElementById("side_bar").innerHTML = side_bar_html;
          }
        }
        request.send(null);
      }

      // When initially loaded, use the data from "map11.php?q=a"
      readMap("a");

    }

    else {
      alert("Sorry, the Google Maps API is not compatible with this browser");
    }

    // This Javascript is based on code provided by the
    // Community Church Javascript Team
    // http://www.bisphamchurch.org.uk/
    // http://econym.org.uk/gmap/

    //]]>
    </script>