Sticky menu with jQuery.

css

.fixedMenu {
	position:fixed;
	background:white;
	z-index:1000;
	width:100%;
	top:0;
}

jQuery

elScroll = $('#zone-header-wrapper').offset().top;
$(window).scroll(function(){
    var windowTop = $(window).scrollTop();
    if(windowTop > elScroll) {
        $('#zone-header-wrapper').addClass('fixedMenu').stop();
    } else {
        $('#zone-header-wrapper').removeClass('fixedMenu').stop();
    }
});