var w='';
function win_closed(winVar) {
  var ua = navigator.userAgent;
  if( !!winVar ) {
    if( ( ua.indexOf('Gecko')!=-1 || ua.indexOf('MSIE 4')!=-1 ) && ua.indexOf('Win')!=-1 ) return winVar.closed;
    else return typeof winVar.document  != 'object';
  }
  else return true;
}

function download(url) {
  if(win_closed(w)) w=window.open(url , 'kizunaDownload' , 'scrollbars=yes,resizable=yes,location=yes,status=yes');
  else w.location.href=url;
  w.focus();
}