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                <header id="masthead" class="site-header">
        <h1 class="site-title"><a href="#" title="A very nice title" rel="home">A very nice title</a></h1>
        <h2 class="site-description">A very nice description.</h2>
    <nav id="site-navigation" class="main-navigation">
	<div class="menu-container">
            <ul id="menu-menu-1" class="nav-menu">
	        <li id="menu-item-1" class="menu-item menu-item-type-custom"><a href="#">Home</a></li>
	 	<li id="menu-item-2" class="menu-item menu-item-type-post_type"><a href="#">About</a></li>
<p>Lorem ipsum dolor sit amet, consectetur adipiscing elit. Nulla magna tellus, varius sit amet metus ut, feugiat posuere nibh. Aliquam sed tempus enim. Sed at porta lacus. Vivamus porttitor blandit dui, vitae pulvinar metus malesuada nec. Quisque condimentum mollis sem, a scelerisque enim placerat sit amet. Proin fermentum, libero a pulvinar viverra, sem sem ultrices odio, id tempus erat tortor in quam. Suspendisse a rhoncus nisl. Praesent ac tellus laoreet, dictum erat sit amet, auctor eros. Nunc placerat suscipit blandit. Ut in vestibulum dolor. Proin a tellus velit. Nam a porttitor lorem. Nulla sit amet dui vel neque dapibus euismod. Nam dictum elementum nisl vitae suscipit. In mi massa, pulvinar sagittis felis nec, euismod placerat ligula. Etiam blandit nibh et ligula posuere iaculis.</p>


                body {
  margin: 0;
  background-color: #456;

header {
  top: -15px;
  background-color: #123;
  position: relative;

hgroup {
  margin:0 auto;  
  background-color: #efefef;

p {
 height: 1800px;
  padding: 0 100px;

#menu-menu-1 {
  list-style: none outside none;
  margin: 0;
  padding: 0;

#menu-menu-1 li {
  float: left;
  position: relative;
  list-decoration: none;
  margin: 0;
  padding: 0;
  text-align: center;
  background-color: #ddd;
  line-height: 40px;

.menu-container {
  height: 40px;
  width: 100%;

.fixed {


                var num = $('#menu-menu-1').offset().top;
//number of pixels before modifying styles

$(window).bind('scroll', function () {
  var st = $(this).scrollTop();
  $('hgroup').css({ 'opacity' : (1 - st/(num)) });
    if ($(window).scrollTop() > num) {        
        $('#menu-menu-1').css({ 'opacity' : (0.8) });
    } else {        
        $('#menu-menu-1').css({ 'opacity' : (1) });