How to load Font Awesome asynchronously

font-awesome.js

<!-- 
    How to load Font Awesome asynchronously
    
    Use: Just put this script on the bottom/footer of your web
-->
<script type="text/javascript">
	(function() {
		var css = document.createElement('link');
		css.href = '//netdna.bootstrapcdn.com/font-awesome/4.0.3/css/font-awesome.min.css';
		css.rel = 'stylesheet';
		css.type = 'text/css';
		document.getElementsByTagName('head')[0].appendChild(css);
	})();
</script>