function foto(url,w,h) {
		var winl = (screen.width - w) / 2;
		var wint = (screen.height - h) / 2;	
		window.open('./f.php?u='+ url,'foto','titlebar=no,toolbar=no,location=no,directories=no,status=no,menubar=no,scrollbars=no,resizable=no,width=' + w + ',height=' + h + ',top=' + wint + ',left=' + winl);
	}