Dynamically add a script of a github gist

insertGist.js

/* Create script element */
var script = document.createElement('script');
script.type = 'text/javascript';
script.src = 'https://gist.github.com/7544705.js';
/* Backup document.write function */
if(!document._write) document._write = document.write;
/* Override document.write function */
document.write = function (str) {
	document.getElementById('scriptCont').innerHTML += str;
};
/* Append the script element to #scriptCont */
document.getElementById('scriptCont').appendChild(script);
/* When the script load, restore the document.write function */
script.onload = function () { 
	setTimeout(function(){
		document.write = document._write;
	},0);
};