function display_flash () {
  is = new BrowserCheck();
  if (is.flash6){
    document.write('  <object name="index" data="img/index.swf" width="589px" height="175px"');
    document.write('    type="application/x-shockwave-flash"><param');
    document.write('    name="movie" value="img/index.swf" /><param');
    document.write('    name="quality" value="best" /><param');
    document.write('    name="menu" value="false" /><param');
    document.write('    name="bgcolor" value="#fff" /></object>');
  } else {
    document.write('  <a href="http://www.adobe.com/go/getflashplayer_jp"><img src="img/flash.gif" width="594" height="160" /></a>');
  }
}