Code to simulate registering onload callbacks with $( <function> ) but before jQuery is included in the page

callbacks_before_jquery.js

window.$ = (function () {
  var cbs = [];
	return function (callback) {
		cbs.push(callback);
		window.onload = function () {
			while( !window.jQuery );
			cbs.map(function (c) { c(); });
		};
	};
})();