function fSize(X){
	document.getElementsByTagName('body')[0].style.fontSize=X;
	if(X=="80%"){
		document.getElementById("fontS").style.backgroundPosition="left center";
		document.getElementById("fontM").style.backgroundPosition="center bottom";
		document.getElementById("fontL").style.backgroundPosition="right bottom";
	}else if(X=="90%"){
		document.getElementById("fontS").style.backgroundPosition="left bottom";
		document.getElementById("fontM").style.backgroundPosition="center center";
		document.getElementById("fontL").style.backgroundPosition="right bottom";
	}else{
		document.getElementById("fontS").style.backgroundPosition="left bottom";
		document.getElementById("fontM").style.backgroundPosition="center bottom";
		document.getElementById("fontL").style.backgroundPosition="right center";
	}
	saveSIZE(X)
}

//cookieの書き込み
function saveSIZE(FONT){
	var tmp='SIZE='+FONT+';path=/';
	document.cookie=tmp;
}

//cookieの読み込み
if(document.cookie!=null){
var temp=document.cookie+';';
var POS=temp.indexOf('SIZE');
	if(POS==-1){
	FONTSIZE="80%"
	}else{
		var POSeq=temp.indexOf('=',POS)+1;
		var POSsm=temp.indexOf(';',POSeq);
		FONTSIZE=temp.substring(POSeq,POSsm);
	}
}



window.onload=function() {
if(FONTSIZE){
	fSize(FONTSIZE);
}
document.getElementById("fontS").onclick=function(){fSize("80%");}
document.getElementById("fontM").onclick=function(){fSize("90%");}
document.getElementById("fontL").onclick=function(){fSize("100%");}
}