function keyOperation(){
  var code=event.keyCode;
  if( code == 0x4c ){
    try{
      objlanguage.contLangmenu( thumbnailmenu );
    }
    catch(e){
      objlanguage.contLangmenu();
    }
    return;
  }
  //if( thumbnailmenu == undefined || !thumbnailmenu )return;
  try{
    if( code==0x27 ){
      thumbnailmenu.nextImg();
    }
    else if( code==0x25 ){
      thumbnailmenu.previousImg();
    }
    else if( (code&0x30)==0x30 ){
      thumbnailmenu.showMenu(code-0x30);
    }
  }
  catch(e){
    return;
  }
}

window.document.onkeydown=keyOperation;