function ColoreMarkerPNG(ag)	{
		var viola = new GIcon();
		viola.image = "http://www.sismicamente.com/img/sh/viola.png";
		viola.iconSize = new GSize(16, 16);
		viola.iconAnchor = new GPoint(8, 8);
		viola.infoWindowAnchor = new GPoint(8, 8);
		var rosa = new GIcon();
		rosa.image = "http://www.sismicamente.com/img/sh/rosa.png";
		rosa.iconSize = new GSize(16, 16);
		rosa.iconAnchor = new GPoint(8, 8);
		rosa.infoWindowAnchor = new GPoint(8, 8);
		var rosso = new GIcon();
		rosso.image = "http://www.sismicamente.com/img/sh/rosso.png";
		rosso.iconSize = new GSize(16, 16);
		rosso.iconAnchor = new GPoint(8, 8);
		rosso.infoWindowAnchor = new GPoint(8, 8);
		var arancione = new GIcon();
		arancione.image = "http://www.sismicamente.com/img/sh/arancione.png";
		arancione.iconSize = new GSize(16, 16);
		arancione.iconAnchor = new GPoint(8, 8);
		arancione.infoWindowAnchor = new GPoint(8, 8);
		var giallo = new GIcon();
		giallo.image = "http://www.sismicamente.com/img/sh/giallo.png";
		giallo.iconSize = new GSize(16, 16);
		giallo.iconAnchor = new GPoint(8, 8);
		giallo.infoWindowAnchor = new GPoint(8, 8);
		var panna = new GIcon();
		panna.image = "http://www.sismicamente.com/img/sh/panna.png";
		panna.iconSize = new GSize(16, 16);
		panna.iconAnchor = new GPoint(8, 8);
		panna.infoWindowAnchor = new GPoint(8, 8);
		var verde = new GIcon();
		verde.image = "http://www.sismicamente.com/img/sh/verde.png";
		verde.iconSize = new GSize(16, 16);
		verde.iconAnchor = new GPoint(8, 8);
		verde.infoWindowAnchor = new GPoint(8, 8);
		var verdino = new GIcon();
		verdino.image = "http://www.sismicamente.com/img/sh/verdino.png";
		verdino.iconSize = new GSize(16, 16);
		verdino.iconAnchor = new GPoint(8, 8);
		verdino.infoWindowAnchor = new GPoint(8, 8);
		var ciano = new GIcon();
		ciano.image = "http://www.sismicamente.com/img/sh/ciano.png";
		ciano.iconSize = new GSize(16, 16);
		ciano.iconAnchor = new GPoint(8, 8);
		ciano.infoWindowAnchor = new GPoint(8, 8);
		var azzurrino = new GIcon();
		azzurrino.image = "http://www.sismicamente.com/img/sh/azzurrino.png";
		azzurrino.iconSize = new GSize(16, 16);
		azzurrino.iconAnchor = new GPoint(8, 8);
		azzurrino.infoWindowAnchor = new GPoint(8, 8);
		var grigio = new GIcon();
		grigio.image = "http://www.sismicamente.com/img/sh/grigio.png";
		grigio.iconSize = new GSize(16, 16);
		grigio.iconAnchor = new GPoint(8, 8);
		grigio.infoWindowAnchor = new GPoint(8, 8);
		var grigetto = new GIcon();
		grigetto.image = "http://www.sismicamente.com/img/sh/grigetto.png";
		grigetto.iconSize = new GSize(16, 16);
		grigetto.iconAnchor = new GPoint(8, 8);
		grigetto.infoWindowAnchor = new GPoint(8, 8);
		var	colorePNG = null;
		if (ag >= 0.275) colorePNG =viola;
		else if (ag >= 0.25) colorePNG =rosa;
		else if (ag >= 0.225) colorePNG =rosso;
		else if (ag >= 0.2)	colorePNG =arancione;
		else if (ag >= 0.175) colorePNG =giallo;
		else if (ag >= 0.15) colorePNG =panna;
		else if (ag >= 0.125) colorePNG =verde;
		else if (ag >= 0.1)	colorePNG =verdino;
		else if (ag >= 0.075) colorePNG =ciano;
		else if (ag >= 0.05) colorePNG =azzurrino;
		else if (ag >= 0.025) colorePNG =grigio;
		else colorePNG =grigetto;
		return colorePNG; 
}