html5 audio and cross browser issues

$(a).hover(function(){
var audio = $('<audio>', {
            autoPlay : 'autoplay',
            controls : 'controls'
        });
        var fileFormat = "mp3";
        var canPlayMP3 = (typeof audio.canPlayType === "function" && audio.canPlayType("audio/mpeg") !== "");
        if (!canPlayMP3) {
            fileFormat = "ogg";
        }
        if(fileFormat == "mp3"){
            addSource(audio, 'audio/ding.mp3');
        }
        else{
            addSource(audio, 'audio/ding.ogg');
        }
});