combine-menu-responsive.js

jQuery(function( $ ){

	$("header #menu-right-menu").addClass("responsive-menu").before('<div id="responsive-menu-icon"></div>');
	
	$("#responsive-menu-icon").click(function(){
		$("header #menu-right-menu").slideToggle();
	});
	
	$(window).resize(function(){
		if(window.innerWidth > 768) {
			$("header #menu-right-menu").removeAttr("style");
		}
	});
	
});

responsive-nav.css

	/* start: responsive nav */
	.nav-primary {
		display: none;
	}
	
	.nav-secondary .mobile,
	.genesis-nav-menu .menu-item {
    	display: block;
    	text-align: center;
	}
	
	.nav-secondary {
    	float: none;
    	margin: 0;
    	width: 100%;
	}
	/* end: responsive menu */

style.css

/* hide our mobile menu items on desktops */
.nav-secondary .mobile {
    display: none;
}