Google Maps GMarker won't appear in correct location

I am modifiying code from the google maps website to try to place a bunch of markers on a map based on an XML page result.
So far, the XML page works properly if i output it to text, the map appears correctly but the Markers will not appear.  I have tried different browsers.
Finally I added a line in the code to manually place a GMarker on the map - it works BUT the location of the Marker is the top left corner of my map, no matter what my map coordinates are.  Also, the marker does not keep its position as i zoom.  It just sits in the corner of my map

The code is supposed to loop through the XML output and place makers on screen.  No markers appear, hence the line to manually add a marker just to make sure i can actually add them.

a snippet of the code:
    function load() {
      if (GBrowserIsCompatible()) {
        var map = new GMap2(document.getElementById("map"));
        map.addControl(new GSmallMapControl());
        map.addControl(new GMapTypeControl());
        map.setCenter(new GLatLng(43.164495, -80.741861), 8);

        // Change this depending on the name of your PHP file
        GDownloadUrl("phpsqlajax_testpageoldphp2.php", function(data) {
          var xml = GXml.parse(data);
          var markers = xml.documentElement.getElementsByTagName("SUPPLIER");
          for (var i = 0; i < markers.length; i++) {
            var SupplierName = markers[i].getAttribute("SupplierName");
            var City = markers[i].getAttribute("City");
            var SiteType = markers[i].getAttribute("SiteType");
            var point = new GLatLng(parseFloat(markers[i].getAttribute("Lat")),
                                    parseFloat(markers[i].getAttribute("Long")));
            var SUPPLIER = createMarker(point, SupplierName, City, SiteType);



          } // i for loop
      map.addOverlay(new GMarker(43.1, -80.1419));
        }); // function data
      }  // GBrowserisCompatible
    } //function load





    function createMarker(point, SupplierName, City, SiteType) {
      var SUPPLIER = new GMarker(point, customIcons[Sitetype]);
      var html = "<b>" + SupplierName + "</b> <br/>" + City;
      GEvent.addListener(SUPPLIER, 'click', function() {
        SUPPLIER.openInfoWindowHtml(html);
      });
      return SUPPLIER;
    }
saunaGAsked:
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Julian HansenCommented:
Change

map.addOverlay(new GMarker(43.1, -80.1419));

To

map.addOverlay(new GMarker(new GLatLng(43.16, -80.1419)));

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