Fade in HTML5 Audio tag (jQuery)

gistfile1.js

var backgroundVolume = 0; // start background volume at 0

$('#main_audio')[0].volume = backgroundVolume; // set volume to 0
$('#main_audio')[0].play(); // start playing tag

var fadeInAudio = setInterval(
	function() {

		if(backgroundVolume <= 1) // if it's not at 1 (full volume)
		{

			$('#main_audio')[0].volume = backgroundVolume; // set new volume

			backgroundVolume += 0.1;

		}
		else
		{

			clearInterval(fadeInAudio); // if at full volume, stop adding to it

		}

}, 100);