Please help....
 
 i have a little problem in asp.net.
when i close the browser IE then run it or press Cntl F5 the javascript getting error : 'console' is undefined then i just close the error dialog box and then press F5 the page will be okay and there's no error anymore working perfectly and shine.
 
it is CSS menu and it was download from css menu maker website. 
 
here is the javascript code:
 
(function ($) {
$.fn.menumaker = function(options) {
var cssmenu = $(this), settings = $.extend({
title: "Menu",
format: "dropdown",
breakpoint: 768,
sticky: false
}, options);
return this.each(function() {
cssmenu.find('li ul').parent().addClass('has-sub');
if (settings.format != 'select') {
cssmenu.prepend('');
$(this).find("#menu-button").on('click', function(){
$(this).toggleClass('menu-opened');
var mainmenu = $(this).next('ul');
if (mainmenu.hasClass('open')) {
mainmenu.hide().removeClass('open');
}
else {
mainmenu.show().addClass('open');
if (settings.format === "dropdown") {
mainmenu.find('ul').show();
}
}
});
multiTg = function() {
cssmenu.find(".has-sub").prepend('');
cssmenu.find('.submenu-button').on('click', function() {
$(this).toggleClass('submenu-opened');
if ($(this).siblings('ul').hasClass('open')) {
$(this).siblings('ul').removeClass('open').hide();
}
else {
$(this).siblings('ul').addClass('open').show();
}
});
};
if (settings.format === 'multitoggle') multiTg();
else cssmenu.addClass('dropdown');
}
else if (settings.format === 'select')
{
cssmenu.append('