ただのjsだね。でも便利っぽくね？

<h1>
<script type="text/javascript">
<!--
if (version['major'] >= 8) {
run_SWF('/swf/logo.swf','450','80','2');
}else{
document.write('<img src=\"/images/home/change_logo.jpg\" width=\"450\" height=\"80\" border=\"0\" usemap=\"#Map2\" alt=\"アクション会社ロゴ\" />');
document.write('<map name="Map2" id="Map2">');
document.write('<area shape="rect" coords="17,22,160,63" href="/" />');
document.write('</map>');
}
-->
</script>
<noscript>
<img src="/images/home/change_logo.jpg" alt="アクション会社ロゴ" width="450" height="80" border="0" usemap="#Map2" />
<map name="Map2" id="Map2">
<area shape="rect" coords="17,22,160,63" href="/" />
</map>
</noscript></h1>