diff --git a/layouts/simple_world/layout.js b/layouts/simple_world/layout.js
index 75279a012..991671b26 100644
--- a/layouts/simple_world/layout.js
+++ b/layouts/simple_world/layout.js
@@ -1,15 +1,20 @@
-$(function() {
+$(function()
+{
 	"use strict";
 
 	/* adjust the width of the right member menu */
-	var menu_width = function() {
-		if($('#layout_gnb>ul>li:first-child').width() > 50) {
+	var menu_width = function()
+	{
+		if($('#layout_gnb>ul>li:first-child').width() > 50)
+		{
 			$('#layout_gnb>ul>li:first-child .layout_dropdown-content, #layout_gnb>ul>li:first-child .layout_dropdown-content a').css('width', $('#layout_gnb>ul>li:first-child').width()).css('min-width', $('#layout_gnb>ul>li:first-child').width());
 		}
 	}
 
-	$( window ).resize(function() {
-		if($('#layout_gnb>ul>li:first-child').width() > 50) {
+	$( window ).resize(function()
+	{
+		if($('#layout_gnb>ul>li:first-child').width() > 50)
+		{
 			menu_width();
 		}
 	});
@@ -17,32 +22,65 @@ $(function() {
 	menu_width();
 
 	/* mobile hamburger menu toggle */
-	$(".layout_mobile_menu").each(function() {
-		$( this ).click(function( event ) {
+	$(".layout_mobile_menu").each(function()
+	{
+		$( this ).click(function( event )
+		{
 			event.preventDefault();
 			layout_toggleMenuOpener( $( this ).get(0) );
 		});
 	});
 
+	/* detect scrolling up or down to hide or show hamburger menu */
+	var previousScroll = 0;
+	$( window ).scroll(function()
+	{
+		var currentScroll = $(this).scrollTop();
+		if (currentScroll > previousScroll)
+		{
+			if($("#layout_menu_toggle").css( 'position' ) === 'fixed' && $("#layout_menu_toggle").attr('data-scroll-down') !== 'true')
+			{
+				$("#layout_menu_toggle").attr('data-scroll-down', 'true');
+				$("#layout_menu_toggle").fadeOut();
+			}
+		}
+		else
+		{
+			if($("#layout_menu_toggle").css( 'position' ) === 'fixed' && $("#layout_menu_toggle").attr('data-scroll-down') === 'true')
+			{
+				$("#layout_menu_toggle").attr('data-scroll-down', '');
+				$("#layout_menu_toggle").fadeIn();
+			}
+		}
+		previousScroll = currentScroll;
+	});
+
 	/* keyboard accessibility for dropdown menu */
-	$(".layout_dropdown").each(function() {
-		$( this ).focusin( function( event ) {
+	$(".layout_dropdown").each(function()
+	{
+		$( this ).focusin( function( event )
+		{
 			$( this ).addClass('layout_focus');
 			$( this ).find("ul.layout_dropdown-content").css('display', 'block').attr('data-dropdown', 'active');
 		});
 	});
 
-	$('body').focusin(function( event ) {
-		if (!$(event.target).parents('.layout_dropdown').is('.layout_dropdown')) {
+	$('body').focusin(function( event )
+	{
+		if (!$(event.target).parents('.layout_dropdown').is('.layout_dropdown'))
+		{
 			$('*[data-dropdown="active"]').css('display', '').attr('data-dropdown', '').parents('li.layout_dropdown').removeClass('layout_focus');
 		}
 	});
 	/* keyboard accessibility for dropdown menu END */
 
-	function layout_toggleMenuOpener(obj) {
-		if(obj.classList.contains("is-active") === true){
+	function layout_toggleMenuOpener(obj)
+	{
+		if(obj.classList.contains("is-active") === true)
+		{
 			var targetMenu = $(obj).attr('data-target');
-			$('#' + targetMenu).slideUp('300', function() {
+			$('#' + targetMenu).slideUp('300', function()
+			{
 				$(this).css('display', '');
 			});
 
@@ -62,7 +100,8 @@ $(function() {
 	}
 
 	// Language Select
-	$('.layout_language>.toggle').click(function(){
+	$('.layout_language>.toggle').click(function()
+	{
 		$('.selectLang').toggle();
 	});
 });
\ No newline at end of file