I have multiple audio files that I want to stream based on the user selects. How do I do that? This is what I have so far and it doesn't seem to work. 

\*UPDATE: Made a few changes and now its claiming that `audio.load();` is not a function. Can anyone tell me why that is? The Code is updated to reflect the changes. 

JavaScript:

```
function updateSource(){ 
    var audio = document.getElementById('oggSource');
    audio.src = 
        'audio/ogg/' + 
        document.getElementById('song1').getAttribute('data-value');
    audio.load();
}

```

HTML:

```
<audio id="audio" controls="controls">
    <source id="oggSource" src="" type="audio/ogg"></source>
    <source id="mp3Source" type="audio/mp3"></source>
        Your browser does not support the audio format.
</audio>

<ul style="list-style: none">
    <li>Sunday May 27, 2012
        <ul style="display: none">
            <li id="song1" data-value="song1.ogg">
                <button onclick="updateSource();">Item1</button>
            </li>
            <li>Item2</li>
            <li>Item3</li>
        </ul>
    </li>
</ul>

```

`Item2` and `Item3` I will want to play a different audio file when they are clicked on.