My javascript library.

jsLib.js

// ==========================
// @name       Javascript Library
// @namespace  http://profiles.google.com/mmmattos
// @version    0.1
// @description  Fubctions to be reused in other scripts. 
// @copyright  2013, Miguel Mattos
// ==========================
function addCustomStyle(p_style) {
    var tags, head, style;
	tags = document.getElementsByTagName('head');
	if (!tags || tags.length == 0) { return; }
	head = tags[0]
	style = document.createElement('style');
	style.type = 'text/css';
	style.innerHTML = p_style;
	head.appendChild(style);
}