/* スタイル変更ボタン表示 */
function displaySwitchImage() {
	document.write("<h2><img src=\"http://www.koujukai.com/images/common/fontsize.gif\" alt=\"文字サイズの変更\" /></h2>");
	document.write("<ul>");
	document.write("<li id=\"font_normal\"><a href=\"#\" onclick=\"changeStyle(1)\" return=\"false\">標準</a></li>");
	document.write("<li id=\"font_large\"><a href=\"#\" onclick=\"changeStyle(2)\" return=\"false\">大</a></li>");
	document.write("<li id=\"font_xlarge\"><a href=\"#\" onclick=\"changeStyle(3)\" return=\"false\">最大</a></li>");
	document.write("</ul>");
}


/* クッキー書き込み */
function createCookie(name,value,days) {
	if (days) {
		var date = new Date();
		date.setTime(date.getTime()+(days*24*60*60*1000));
		var expires = "; expires="+date.toGMTString();
	}
	else expires = "";
	document.cookie = name+"="+value+expires+"; path=/";
}

/* クッキー読み込み */
function readCookie(name) {
	var nameEQ = name + "=";
	var ca = document.cookie.split(';');
	for(var i=0;i < ca.length;i++) {
		var c = ca[i];
		while (c.charAt(0)==' ') c = c.substring(1,c.length);
		if (c.indexOf(nameEQ) == 0) return c.substring(nameEQ.length,c.length);
	}
	return null;
}


/* スタイル変更 */
function changeStyle(stylenum) {
	var elements = document.getElementsByTagName('body');

	if(stylenum == '1') {/* Normal Size */
		elements[0].setAttribute('class','normal');
		elements[0].setAttribute('className','normal');
	}
	else if(stylenum == '2') {/* Large Size */
		elements[0].setAttribute('class','large');
		elements[0].setAttribute('className','large');
	}
	else if(stylenum == '3') {/* Maximam Size */
		elements[0].setAttribute('class','xlarge');
		elements[0].setAttribute('className','xlarge');
	}

	createCookie('style', stylenum, 365);
}