/*
 * Alternative Style: Working With Alternate Style Sheets
 * http://www.alistapart.com/articles/alternate/
 */

function setActiveStyleSheet(title) {
	var i,a,main;
	for (i=0; (a=document.getElementsByTagName("link")[i]); i++) {
		if (a.getAttribute("rel").indexOf("style")!=-1&&a.getAttribute("title")) {
			a.disabled=true;
			if (a.getAttribute("title")==title)
				a.disabled=false;
		}
	}
	setTextSizeBtn(title);
}
function getActiveStyleSheet() {
	var i,a;
	for (i=0; (a=document.getElementsByTagName("link")[i]); i++) {
		if (a.getAttribute("rel").indexOf("style")!=-1&&a.getAttribute("title")&&!a.disabled)
			return a.getAttribute("title");
	}
	return null;
}
function getPreferredStyleSheet() {
	var i,a;
	for(i=0; (a=document.getElementsByTagName("link")[i]); i++) {
		if(a.getAttribute("rel").indexOf("style")!=-1&&a.getAttribute("rel").indexOf("alt")==-1&&a.getAttribute("title"))
			return a.getAttribute("title");
	}
	return null;
}
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=/";
}
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;
}
var __onload_save_style_switcher = window.onload;
window.onload = function() {
	if (__onload_save_style_switcher) __onload_save_style_switcher();
	var cookie=readCookie("style");
	var title=cookie?cookie:getPreferredStyleSheet();
	setActiveStyleSheet(title);
	document.getElementById("fontsizenavi").style.display = "";
}
var __onunload_save = window.onunload;
window.onunload　= function() {
	if (__onunload_save) __onunload_save();
	var title=getActiveStyleSheet();
	createCookie("style",title,365);
}


function setTextSizeBtn(name) {
	if(document.getElementById("text_l")!=null) {
		if(name=="standard") {
			document.getElementById("text_m").blur();
			document.getElementById("text_m").style.backgroundPosition = "left bottom";
			document.getElementById("text_l").style.backgroundPosition = "left top";
		} else {
			document.getElementById("text_l").blur();
			document.getElementById("text_m").style.backgroundPosition = "left top";
			document.getElementById("text_l").style.backgroundPosition = "left bottom";
		}
	}
}