Tampermonkey script to load jQuery to a page

gistfile1.js

addJQuery(main); 

function addJQuery(callback)
{
	var script = document.createElement("script");
	script.setAttribute("src", "https://code.jquery.com/jquery-1.11.1.min.js");

	script.addEventListener('load', function() {
		var script = document.createElement("script");
		script.textContent = "window.jQ=jQuery.noConflict(true);(" + callback.toString() + ")();";
		document.body.appendChild(script);
	}, false);

	document.body.appendChild(script);
}

function main()
{
	alert("jQuery loaded & ready!");
}