Play sound file when image is clicked

First you have to use jQuery. You may create some <div> in your page having some id, for example;

<div id="wrap">&nbsp;</div>.

Then, in your JavaScript, when you want to play the file, just add

$('#wrap').append('<embed id="embed_player" src="audio.wav" autostart="true" hidden="true"></embed>');

the whole code looks something like;

<script type="text/javascript" src="jquery-1.7.1.js"></script>
<script type="text/javascript">
$(document).ready( function() {
$('#track1').click(function(){
   $('#wrap').append('<embed id="embed_player" src="audio.wav" autostart="true" hidden="true"></embed>');
});
});
</script>
<img name="track1" src="images/track1.png" width="180" height="180" border="0" id="track1" alt="" />
<div id="wrap">&nbsp;</div>

Hope this helps.

This answer by @klaustopher helped me. He wrote:

HTML5 has the new -Tag that can be used to play sound. It even has a pretty simple JavaScript Interface:

  <audio id="sound1" src="yoursound.mp3" preload="auto"></audio>
  <button onclick="document.getElementById('sound1').play();">Play
  it</button>

Here's how I implemented his advice so that clicking on the Font Awesome icon "fa-volume-up" (located on the Web page after "mule.") results in "donkey2.mp3" sound playing (note: mp3 doesn't play in all browsers):

<p>In short, you're treated like a whole person, instead of a rented mule. 
<audio id="sound1" src="assets/donkey2.mp3" preload="auto"></audio>
<a class="icon fa-volume-up" onclick="document.getElementById('sound1').play();"></a></p>