function getArchiveTileURL(bounds)
	{
		var res = this.map.getResolution();
		var x = Math.round((bounds.left - this.maxExtent.left) / (res * this.tileSize.w));
		var y = Math.round((this.maxExtent.top - bounds.top) / (res * this.tileSize.h));
		var z = this.map.getZoom();
		var limit = Math.pow(2, z);

		if (y < 0 || y >= limit)
		{
			return null;
		} else {
			x = ((x % limit) + limit) % limit;

			var url = this.url;
			var rnd = Math.floor(Math.random()*10);

			if(rnd > 9 || rnd < 0)
				rnd = 0;

			var path = "0" + rnd + "/" + z + ".zip/"+ x + "-" + y + ".png";

			if(z > 5 && z < 10)
			{
				var i = Math.floor(x / 64);
				var j = Math.floor(y / 64);

				path = "0" + rnd + "/" + z + "-" + i + "-" + j + ".zip/"+ x + "-" + y + ".png";
			} else if(z >= 10) {
				var j = Math.floor(y / 1024);
				var md5 = hex_md5("" + z + "-" + x + "-" + j).substr(0,2);
				if(md5 == "2b")
					md5 = "2B";
				
				path = md5.substr(0,2) + "/" + z + "-" + x + "-" + j + ".zip/" + x + "-" + y + ".png";
			}

			if(url instanceof Array)
				url = this.selectUrl(path, url);

			return url + path;
		}
	}

	function lonLatToMercator(ll)
	{
		var lon = ll.lon * 20037508.34 / 180;
		var lat = Math.log(Math.tan((90 + ll.lat) * Math.PI / 360)) / (Math.PI / 180);

		lat = lat * 20037508.34 / 180;

		return new OpenLayers.LonLat(lon, lat);
	}

	function lonToX(lon, zoom)
	{
		return (Math.floor((lon + 180) / 360 * Math.pow(2, zoom)));
	}

	function latToY(lat, zoom)
	{
		return (Math.floor((1 - Math.log(Math.tan(lat * Math.PI / 180) + 1 / Math.cos(lat * Math.PI / 180)) / Math.PI) / 2 * Math.pow(2, zoom)));
	}

	function tileToLon(x, zoom)
	{
		return (x / Math.pow(2, zoom) * 360 - 180);
	}

	function tileToLat(y, zoom)
	{
		var n = Math.PI - 2 * Math.PI * y / Math.pow(2, zoom);
		return (180 / Math.PI * Math.atan(0.5 * (Math.exp(n) - Math.exp(-n))));
	}