o on hover
	var info = L.control();

	info.onAdd = function (map) {
		this._div = L.DomUtil.create('div', 'info');
		this.update();
		return this._div;
	};

	info.update = function (props) {
		this._div.innerHTML = '<h4>US Population Density</h4>' +  (props ?
			'<b>' + props.name + '</b><br />' + props.density + ' people / mi<sup>2</sup>'
			: 'Hover over a state');
	};

	info.addTo(map);


	// get color depending on population density value
	function getColor(d) {
		return d > 1000 ? '#800026' :
				d > 5