var geoserver = "10x.11x.10x.11x";

var baseOption = {
	minZoom : 15,
	maxZoom : 19
}

var base2dUrl = 'http://' + geoserver + ':9500/geoserver/www/tms/2d/base/{z}/{x}/{y}.png';
var base2d = L.tileLayer(base2dUrl, baseOption);