function fncSetCookie(){
  var tmp;
  tmp = "setFSize=" + intSize + "; ";
  tmp += "path=/;";
  document.cookie = tmp;
}

strCookie = document.cookie;

function fncSizeChange(intSizeChange){
  intSize = intSize + intSizeChange;
  if(intSize>5){
    intSize = 5;
  }
  if(intSize<1){
    intSize = 1;
  }
  
  fncSetCookie();
  location.reload();

}


if(strCookie.indexOf("setFSize") < 0 ){
  intSize = 3;
}else{
  intSizePoint = strCookie.indexOf("setFSize") + "setFSize".length + 1;
  strSize = strCookie.charAt(intSizePoint);
  intSize = eval(strSize);
  //数値でない場合(TRUE)
  if(isNaN(intSize)){
    intSize = 3;
  }
}

document.write("<link href='https://ssl.syakyo-niigatacity.or.jp/css/size" + intSize + ".css' rel='stylesheet' type='text/css'>");