<div id='musiclsit'></div>

<script>
    
    function addMusic(path, list)
    {
        if(window.addEventListener)
        { 
            var str = '<audio src='+ path +' hidden="true" autoplay="true" loop="true"></audio>';
            document.getElementById(list).innerHTML = str;
        }
        else if(window.attachEvent)
        { 
           var str = '<embed src='+ path +' autostart="true" loop="true" hidden="true"></embed>';
           document.getElementById(list).innerHTML = str;
        }
    }

    addMusic('swf/bgm.mp3', 'musiclsit');

</script>