//Used to show locations eg local groups on a google map
//June 2008 - JN changed to use Lat/long values, and restrict zoom
// Create FOE marker icon
        
    var icon = new GIcon();
        icon.image = "/imgs/common/map_marker.gif";
        icon.iconSize = new GSize(12, 12);
        icon.iconAnchor = new GPoint(1,1);
        icon.infoWindowAnchor = new GPoint(5, 1); 
        
            
//create info box with group URL    
    function createInfoMarker(point, address, url, group_name, location) {
        var marker = new GMarker(point,icon);
        var maddress = 'null';
        var text1 = '<div style="width: 12em; font-size: small; font-family: Arial, Helvetica;"><p><span style="font-weight: bold;">'+ address +', '+ location +'</span><br /><span style="font-size: 80%;">Thanks to '+ group_name +' for this signup</span></p></div>';
        var text2 = '<div style="width: 12em; font-size: small; font-family: Arial, Helvetica;"><p><span style="font-weight: bold;">'+ address +', '+ location +'</span><br /></p></div>';
        if (group_name == "unknown")
        {
        maddress = text2;
        }
        else
        {
        maddress = text1;
        }

         GEvent.addListener(marker, "click",
            function() {
                marker.openInfoWindowHtml(maddress);
            }
        );
        return marker;
    }
    
    //Get initial lat, long, zoom level and map type from calling page
  function loadmap(lat,long,z,maptype) {
      
     //Fade the map out slightly - value can be anything less than 1. 
    G_NORMAL_MAP.getTileLayers()[0].getOpacity = function () {return 0.8;};
    //Set max and min zoom levels
     G_NORMAL_MAP.getMinimumResolution = function () { return 5 }; 
     G_NORMAL_MAP.getMaximumResolution = function () { return 13 }; 
      
     var map = new GMap2(document.getElementById("map"));
     map.addControl(new GLargeMapControl());
     
      //Show scale
      map.addControl(new GScaleControl());
    
      //Add control to change type of map
      //map.addControl(new GMapTypeControl());
     
      // Center the map on a particular point, with a certain zoom level
    map.setCenter(new GLatLng(lat,long), z, maptype);
    
      // Download the data in from an xml source file and load it on the map. 
      var request = GXmlHttp.create();
      request.open("GET", "/xml/renewables_signups.xml", true);
      request.onreadystatechange = function() {
        if (request.readyState == 4) {
          var xmlDoc = request.responseXML;
          var markers = xmlDoc.documentElement.getElementsByTagName("item");
          for (var i = 0; i < markers.length; i++) {
            var lati = markers[i].getElementsByTagName("Lat")[0].firstChild.nodeValue;
            var longi = markers[i].getElementsByTagName("Long")[0].firstChild.nodeValue;
            var point = new GLatLng(parseFloat(lati),parseFloat(longi));
            var location = markers[i].getElementsByTagName("Location")[0].firstChild.nodeValue;
            var group_name = markers[i].getElementsByTagName("Local_Group")[0].firstChild.nodeValue;
            var address = markers[i].getElementsByTagName("Title")[0].firstChild.nodeValue;


        
        //Ignore any entries without lat/long values and where local group source is unknown
        //NB else IE stops showing markers when NULL value occurs, and FF shows them in the wrong place
        
        if (lati != "NULL" && longi != "NULL") {
            var url = markers[i].getElementsByTagName("Title")[0].firstChild.nodeValue;
            var marker = new GMarker(point);
            var marker =createInfoMarker(point, address, url, group_name, location);
           map.addOverlay(marker);               
      }
      }
      }
      }
      request.send(null);
    }