function showZokuseiArea(mode) {
	divZokusei = document.getElementById("zokusei");
	imgZokuseiDispOnA = document.getElementById("img_zokusei_on");
	imgZokuseiDispOffA = document.getElementById("img_zokusei_off");
	if ( mode == "on" ){
		divZokusei.style.display = "";
		imgZokuseiDispOnA.style.display = "none";
		imgZokuseiDispOffA.style.display = "";
	}
	else if (mode == "off"){
		divZokusei.style.display = "none";
		imgZokuseiDispOnA.style.display = "";
		imgZokuseiDispOffA.style.display = "none";
	}
}