各種ブラウザに対応した音楽再生用jsコードを実装する

var bgSoundFile = " 
if (navigator.userAgent.toLowerCase().indexOf("msie") != -1) 
{    document.write(&#39;<bgsound src="&#39; + bgSoundFile + &#39;" loop="-1">&#39;);
} else if (navigator.userAgent.toLowerCase().indexOf("firefox") != -1) 
{    document.write(&#39;<object data="&#39; + bgSoundFile + &#39;" type="application/x-mplayer2" 
width="0" height="0"><param name="filename" value="&#39; + bgSoundFile + &#39;">
<param name="autostart" value="1"><param name="playcount" value="infinite">
</object>&#39;);} 
else {    document.write(&#39;<audio src="&#39; + bgSoundFile + &#39;" autoplay="autoplay" loop="loop">
<object data="&#39; + bgSoundFile + &#39;" type="application/x-mplayer2" width="0" height="0">
<param name="filename" value="&#39; + bgSoundFile + &#39;"><param name="autostart" value="1">
<embed height="2" width="2" src="&#39; + bgSoundFile + &#39;" pluginspage="http://www.apple.com/quicktime/download/" 
type="video/quicktime" controller="false" controls="false" autoplay="true" autostart="true" loop="true" bgcolor="#000000">
</embed>
</object>
</audio>&#39;);
}