GetMyTopoTile=function(a,b,c) {
 var lURL=this.myBaseURL;
 lURL+=b;
 lURL+="/"+a.x;
 lURL+="/"+a.y+".png";
 return lURL;
}

var mytopoCopy = new GCopyright(1,new GLatLngBounds(new GLatLng(-90, -180), new GLatLng(90, 180)),0,'&#169; MyTopo <a href="http://www.mytopo.com/google/index.cfm" target="_blank"><b>(Terms of Use)</b></a>')

var mytopoc = new GCopyrightCollection('');
mytopoc.addCopyright(mytopoCopy);

var tileMytopo = new GTileLayer(mytopoc,13,16);
tileMytopo.myLayers='topoG';
tileMytopo.myFormat='image/png';
tileMytopo.myBaseURL='http://maps.mytopo.com/mytopo/tilecache.py/1.0.0/topoG/';

tileMytopo.getTileUrl=GetMyTopoTile;

var mytopoLayer=[tileMytopo];

var MYTOPO_MAP = new GMapType(
	mytopoLayer,
	G_SATELLITE_MAP.getProjection(),
	"MyTopo",
	G_PHYSICAL_MAP
);

//map.addMapType(MYTOPO_MAP);