load OM api.js asynchronously

load-api-js-async.js

(function() {
	var s = document.createElement('script');
	s.type = 'text/javascript';
	s.src = 'https://a.omappapi.com/app/js/api.min.js';
	s.setAttribute('data-user', USERID);
	s.setAttribute('data-account', ACCOUNTID);
	(document.getElementsByTagName('body')[0] || document.documentElement).appendChild(s);
})();

load-api-js-async.min.js

!function(d){var e=d.createElement("script");e.type="text/javascript",e.src="https://a.omappapi.com/app/js/api.min.js",e.setAttribute('data-user',USERID),e.setAttribute('data-account',ACCOUNTID),(d.getElementsByTagName("body")[0]||d.documentElement).appendChild(e)}(document);