Menu fixed

$(function(){
$(window).scroll(function(){ scroll_menu(); });
$(window).load(function(){ scroll_menu(); });
scroll_menu();
});

function scroll_menu()
{
var offsetfilter = $("#header-wrapper").height() - 25;
var scrollY = $(window).scrollTop();
var menu = $('#top-container');
if(scrollY > offsetfilter)
{
menu
.css('position','fixed')
.css('top', '-113px');
}
else
{
menu
.css('position','absolute')
.css('top', '0px');
}
}

//HTML
<div id="top-container" style="position: absolute; top: 0px; display: block; opacity: 1;">
<div id="header-wrapper">
<div id="menu-wrapper">