Do not use document write to create script tag

docwrite.js

//Do not use docwrite
document.write('<script src="' + src + '" type="text/javascript"><\/script>'):

//Use Async
var newScript = document.createElement("script");
newScript.async = true;
newScript.src = "http://xxxxxxxxxxxxxxxxxxxx.js";
var s0 = document.getElementsByTagName('script')[0];
s0.parentNode.insertBefore(newScript, s0);

//Reference : http://www.stevesouders.com/blog/2009/04/27/loading-scripts-without-blocking/