Use jQuery to load scripts asynchronously

jquery.loadasync.js

// Load scripts asynchronously
jQuery.loadAsync = function(url, callback) {
	// Don't use $.getScript since it disables caching
	jQuery.ajax({
		'url': url,
		'dataType': 'script',
		'cache': true,
		'success': callback || jQuery.noop
	});
};

$.getScript support caching when using the options object signature like this:

$.getScript({
    url: "foo.js",
    cache: true
})