function getBrowserLang() {
 if (navigator.appName == "Microsoft Internet Explorer" && document.all) {
  return navigator.browserLanguage;
 } else if (document.getElementById) {
  return navigator.language.substr(0,2);
 } else if (navigator.language) {
  return navigator.language;
 }
 
 return null;
}

function pagechange(){
 var bLang = getBrowserLang();
if (! bLang == "ja"){
    location.href="/eng/index.html";
  }
}