Edit in JSFiddle

require(['jquery'], function (JetCSKJQ) {

	var jqMenu = JetCSKJQ;

	jqMenu(document).ready(function(){
		// Get Navigator DIV element and invoke the onClick event;
		var navigator = document.getElementById('PTNB$PTNUI_NB_MENU');
		jqMenu(navigator).click();
	});

});