var lanlist;

function setlangonradio(){
  
  var frm = document.formlang;
  if( navigator.userLanguage == "ja" ){
    frm.elements[1].checked=true;
  }else if( navigator.userLanguage == "ru" ){
    frm.elements[2].checked=true;
  }else if( navigator.userLanguage == "zh" || navigator.userLanguage == "zh-cn" ){
    frm.elements[3].checked=true;
  }else{
    frm.elements[0].checked=true;
  }
  langMenubyparam();
}

function getlang(){
  
  var lang = 0;
  var frm = document.formlang;
  for(i=0; i<4; i++){
    if( frm.elements[i].checked == true ){
      lang = i;
      break;
    }
  }
  return lang;
}

function initlang(){
  
  lanlist = new Array;
  lanlist[0] = ".en.html";
  lanlist[1] = ".ja.html";
  lanlist[2] = ".ru.html";
  lanlist[3] = ".zh.html";
}
initlang();

function moveto( adr ){
  
  var langdex = getlang();
  location.href = adr + lanlist[langdex];
}

function langMenubyparam(){
  
  var receivestr = location.search.substring(1);
  //alert(receivestr);
  if( receivestr.split('=')[0] == "lang" ){
    var frm = document.formlang;
    switch( receivestr.split('=')[1] ){
      case "0":frm.elements[0].checked=true;break;
      case "1":frm.elements[1].checked=true;break;
      case "2":frm.elements[2].checked=true;break;
      case "3":frm.elements[3].checked=true;break;
    }
  }
}