function SelectOverview(type) {
	if (readCookie("style") != 'text') {
		document.getElementById("preface_list").style.display = 'none';
		document.getElementById("preface_title").style.fontWeight = 'normal';
		document.getElementById("part1_list").style.display = 'none';
		document.getElementById("part1_title").style.fontWeight = 'normal';
		document.getElementById("part2_list").style.display = 'none';
		document.getElementById("part2_title").style.fontWeight = 'normal';
		document.getElementById("part3_list").style.display = 'none';
		document.getElementById("part3_title").style.fontWeight = 'normal';
		document.getElementById("seating_position_list").style.display = 'none';
		document.getElementById("seating_position_title").style.fontWeight = 'normal';
		document.getElementById("faq_list").style.display = 'none';
		document.getElementById("faq_title").style.fontWeight = 'normal';
		document.getElementById(type + '_list').style.display = 'block';
		document.getElementById(type + '_title').style.fontWeight = 'bold';
		document.getElementById("overview").style.backgroundImage = "url('/images/hwadu/bg_" + type + "_list.gif')";
	}
}