function kotoba() {
	window.open("./kotoba.html", "_blank", "toolbar=no,location=no,directories=no,status=no,menubar=no,scrollbars=yes,resizable=no,width=500,height=500");
}
function intro() {
	window.open("./intro.html", "_blank", "toolbar=no,location=no,directories=no,status=no,menubar=no,scrollbars=yes,resizable=no,width=500,height=500");
}