Insert JavaScript & CSS Dynamically

Below is the code for Adding Javascript:


var headID = document.getElementsByTagName("head")[0];
var newScript = document.createElement('script');
newScript.type = 'text/javascript';
newScript.src = 'http://www.somedomain.com/somescript.js';
headID.appendChild(newScript);

Below is the code for Adding CSS:

var headID = document.getElementsByTagName("head")[0];

var cssNode = document.createElement('link');

cssNode.type = 'text/css';

cssNode.rel = 'stylesheet';

cssNode.href = 'FireFox.css';

cssNode.media = 'screen';

headID.appendChild(cssNode);