var selectedTiles = [];
	var z = 8;
	var maxTiles = Math.pow(2, z);

	var map = new OpenLayers.Map("Map",
	{
		    maxExtent: new OpenLayers.Bounds(-20037508.34,-20037508.34,20037508.34,20037508.34),
		    numZoomLevels:18,
		    maxResolution:156543.0339,
		    units:'m',
		    projection: "EPSG:900913",
		    displayProjection: new OpenLayers.Projection("EPSG:4326")
	});

	var layer = new OpenLayers.Layer.TMS("Archive.org Tiles",
					["http://www.archive.org/download/SharedMapTiles"],
					{ type: 'png', getURL: getArchiveTileURL, displayOutsideMaxExtent: true,
						attribution: '<a href="http://fosm.org">(C) CC-by-SA FOSM.org</a>', transitionEffect: 'resize'});
	map.addLayer(layer);

	var control = new OpenLayers.Control();

        OpenLayers.Util.extend(control,
	{
              draw: function () {
                        // this Handler.Box will intercept the shift-mousedown
                        // before Control.MouseDefault gets to see it
                        this.box = new OpenLayers.Handler.Box( control,
                            {"done": this.notice},
                            {keyMask: OpenLayers.Handler.MOD_SHIFT});
                        this.box.activate();
                    },

                    notice: function (bounds)
                    {
                        var ul = map.getLonLatFromPixel(new OpenLayers.Pixel(bounds.left, bounds.top));
                        var br = map.getLonLatFromPixel(new OpenLayers.Pixel(bounds.right, bounds.bottom));
                        ul.transform(new OpenLayers.Projection("EPSG:900913"), new OpenLayers.Projection("EPSG:4326"));
                        br.transform(new OpenLayers.Projection("EPSG:900913"), new OpenLayers.Projection("EPSG:4326"));

			var x1 = lonToX(ul.lon, z);
			var y1 = latToY(ul.lat, z);
			var x2 = lonToX(br.lon, z);
			var y2 = latToY(br.lat, z);

			var tileReq = (x2 - x1) * (y2 - y1);

			if(tileReq <= 500)
			{
				for(i = x1; i <= x2; i++)
					for(j = y1; j <= y2; j++)
						invertTileAtLL(i, j);
			} else
				alert("You tried to invert too many tiles at once, the limit is 100, you attempted "+tileReq);
                    }
        });

	map.addControl(control);

	map.setCenter(lonLatToMercator(new OpenLayers.LonLat(lng, lat)), zoom);

	OpenLayers.IMAGE_RELOAD_ATTEMPTS = 3;
	OpenLayers.Util.onImageLoadError = function()
	{
	    this.src = "404.png";
	}

	var vectorLayer = new OpenLayers.Layer.Vector("Vector Layer");
	map.addLayer(vectorLayer);

	var style_green = {
				strokeColor: "#000000",
				strokeOpacity: 0.2,
				strokeWidth: 1,
				fillColor: "#00FF00",
				fillOpacity: 0.1
	};

	map.events.register('click', map, handleMapClick);

	map.addControl(new OpenLayers.Control.Attribution());

	function handleMapClick(evt)
	{
		var ll = map.getLonLatFromPixel(evt.xy);
		ll.transform(new OpenLayers.Projection("EPSG:900913"), new OpenLayers.Projection("EPSG:4326"));
		var x = lonToX(ll.lon, z);
		var y = latToY(ll.lat, z);

		invertTileAtLL(x, y);
	}

	function invertTileAtLL(x, y)
	{
		var tileID = x * maxTiles + y;

		if(selectedTiles.length > tileID && selectedTiles[tileID] != undefined)
		{
			var thisTile = selectedTiles[tileID];
			vectorLayer.removeFeatures([thisTile]);
			selectedTiles[tileID] = undefined;
			return;
		}

		var lat1 = tileToLat(y, z);
		var lon1 = tileToLon(x, z);
		var lat2 = tileToLat(y + 1, z);
		var lon2 = tileToLon(x + 1, z);

//		alert("Z: " + z + ", Lat1: " + lat1 + ", Lon1: " + lon1 + ", Lat2: " + lat2 + ", Lon2: " + lon2);

		var p1 = llToPoint(new OpenLayers.Geometry.Point(lon1, lat1));
		var p2 = llToPoint(new OpenLayers.Geometry.Point(lon2, lat1));
		var p3 = llToPoint(new OpenLayers.Geometry.Point(lon2, lat2));
		var p4 = llToPoint(new OpenLayers.Geometry.Point(lon1, lat2));

		var points = new Array(p1, p2, p3, p4, p1);

		var linearRing = new OpenLayers.Geometry.LinearRing(points);
		var thisTile = new OpenLayers.Feature.Vector(linearRing, null, style_green);
		vectorLayer.addFeatures([thisTile]);

		selectedTiles[tileID] = thisTile;
	}

	function llToPoint(p)
	{
		return p.transform(new OpenLayers.Projection("EPSG:4326"), map.getProjectionObject());
	}