// JavaScript Document


function changel(){
	var bodyElements = document.getElementsByTagName("BODY");
	for ( var i = 0; i < bodyElements.length; i++ ) {
    if( bodyElements[i].id == "tagt" ) {
		var tagt = bodyElements[i];
    }
	}
	tagt.style.fontSize="120%";
	CookieWrite('120');
	CookieRead('Fsize');
}

function changem(){
	var bodyElements = document.getElementsByTagName("BODY");
	for ( var i = 0; i < bodyElements.length; i++ ) {
    if( bodyElements[i].id == "tagt" ) {
		var tagt = bodyElements[i];
    }
	}	tagt.style.fontSize="80%";
	CookieWrite('80');
	CookieRead('Fsize');
}

function changes(){
	var bodyElements = document.getElementsByTagName("BODY");
	for ( var i = 0; i < bodyElements.length; i++ ) {
    if( bodyElements[i].id == "tagt" ) {
		var tagt = bodyElements[i];
    }
	}	tagt.style.fontSize="60%";
	CookieWrite('60');
	CookieRead('Fsize');
}
/*クッキー書き込み*/
function CookieWrite(currentSize){
	if(!navigator.cookieEnabled){    // クッキーが利用可能かどうか
    alert(";クッキーへの書き込みができません");
    return;
  }
  sday = new Date();
  sday.setTime(sday.getTime() + (30 * 1000 * 60 * 60 * 24));
  s2day = sday.toGMTString();
  textdatas = "Fsize=" + currentSize;
//textdatas = escape(textdatas);
//alert(escape(textdatas));
document.cookie = "Fsize=" + currentSize +";path=/;" + ";expires=" + s2day ;
//document.cookie = escape(textdatas)+ ";expires=" + s2day;
}

/*クッキー読み込み*/
function CookieRead(kword){
	var divElements = document.getElementsByTagName("LI");
	for ( var i = 0; i < divElements.length; i++ ) {
    if( divElements[i].id == "fsize01" ) {
		fsize01a =divElements[i];
    }
    if( divElements[i].id == "fsize02" ) {
		fsize02a =divElements[i];
    }
    if( divElements[i].id == "fsize03" ) {
		fsize03a =divElements[i];
    }
}

	var bodyElements = document.getElementsByTagName("BODY");
	for ( var i = 0; i < bodyElements.length; i++ ) {
    if( bodyElements[i].id == "tagt" ) {
		var tagt = bodyElements[i];
    }
	}

//	tagt = document.getElementsByTagName("BODY");
	var fsize01=document.getElementById('fsize01');
//	alert(tagt);
	var fsize02=document.getElementById('fsize02');
	var fsize03=document.getElementById('fsize03');
if(typeof(kword) == "undefined"){
	return "";
}
  kword = kword + "=";
  currentSize = "";
  scookie = document.cookie + ";";
  start = scookie.indexOf(kword);
  if (start != -1){ 
    end = scookie.indexOf(";", start);
    currentSize = unescape(scookie.substring(start + kword.length, end));
  }
  	currentSize = Number(currentSize);
	if(currentSize == 0){
		currentSize = 85;
	}
		tagt.style.fontSize = currentSize + "%";
	if(currentSize == 60){
		fsize03a.firstChild.style.backgroundPosition = "-110px -26px";
		fsize02a.firstChild.style.backgroundPosition = "-87px 0px";
		fsize01a.firstChild.style.backgroundPosition = "-64px 0px";
	}
	if(currentSize == 80){
		fsize03a.firstChild.style.backgroundPosition = "-110px 0px";
		fsize02a.firstChild.style.backgroundPosition = "-87px -26px";
		fsize01a.firstChild.style.backgroundPosition = "-64px 0px";
	}
	if(currentSize == 120){
		fsize03a.firstChild.style.backgroundPosition = "-110px 0px";
		fsize01a.firstChild.style.backgroundPosition = "-64px -26px";
		fsize02a.firstChild.style.backgroundPosition = "-87px 0px";
	}
	

  return currentSize;

}